Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e5c54b90316dd1…

MALICIOUS

PDF

36.8 KB Created: 2020-10-21 07:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 065478f32bb9f887a5616c6afbc7eb38 SHA-1: 3026f7149f4eb7c2b5fcbbd1df12193330f8c21a SHA-256: 48e5c54b90316dd10c7c0cf93f8ce76e74abc5581cae657e63b54e8ef200899f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector URL associated with malicious activity. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an intent to trick users into visiting it for malicious purposes, likely as part of a phishing or scam campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=bedava+m%25C3%25BCzik+indir+dur In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f893521f335c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f8d442d75e16.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/xawinaf.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/xesadubovubanu-diniwadun-dezuvetapazufog.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/zefomojozur_gegip_mereve.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/186bee3.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/10c53f54e69b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de47b34-d79f-412f-8687-86cac0ffa136/86014404141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c95284c3-1b64-48bf-a769-a0f240b7acc0/xeligexudutibuzoroweruba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c556c8-7c4d-4a87-9a67-2dd9bfbc90b1/ripozimodidowobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05284539-ce5e-467c-8f8c-2a10b2c17814/63712261950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6695/2346/files/fazirozidurowumoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5916/2521/files/nibowurajati.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1928/8743/files/99191495100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/databogexamunefuzoxazevu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/27986659297.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/ark_park_vr_trophy_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9202/4739/files/96925766841.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3464/7451/files/the_scalpel_and_the_silver_bear.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6474/1026/files/38233807285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0136/8735/files/62663497485.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5054 5104 bytes
SHA-256: 8a2bb70335a48463fc3bf063548b4b2e93cbe2d737a8248e0de39b34b7611911
font_01_sfnt_off00006174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6174 10772 bytes
SHA-256: 3938a3274aedf41ada7cef96791a1b5efa248c9728c88fbf85a5e8dae283818f