Malicious PDF — malware analysis report

Static analysis result for SHA-256 75da3387a2465678…

MALICIOUS

PDF

38.0 KB Created: 2020-10-14 05:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a83d02a6aa5b343f4aad9d7dc8937933 SHA-1: 2ad4febe8e4dc17c44b6817570afacfcb57b1748 SHA-256: 75da3387a2465678fe9eb40e85af22ba1f31b5a121283b88f288b0b3fe0a2f58
194 Risk Score

Malware Insights

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

This PDF document contains a link to a redirector URL that is associated with malicious activity, specifically a lure for downloading software. The document body and embedded links suggest a phishing attempt to trick users into downloading potentially unwanted or malicious applications. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=download+polarr+pro+apk+free In PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4867245.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7904132.pdfIn PDF document text
    • https://site-1039156.mozfiles.com/files/1039156/64014175828.pdfIn PDF document text
    • https://site-1037246.mozfiles.com/files/1037246/67487444311.pdfIn PDF document text
    • https://site-1043599.mozfiles.com/files/1043599/8110735659.pdfIn PDF document text
    • https://site-1036957.mozfiles.com/files/1036957/narem.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/80f0ee0a-66fb-4f1c-9af0-9033e131963f/77988628959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce535485-afd1-446b-9b19-d7c83c508f01/13717626995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5389e2-2a6f-4b1a-ab13-67c251a5ab55/linesubabizofegegaju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8981/4187/files/tuvadapipi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/lg_inverter_direct_drive_7.5kg_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6724/4183/files/hercules_hooks_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9196/1017/files/86539617821.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4446/1467/files/odyssey_of_the_mind_problem_2_division_1.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_off00005a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A17 5012 bytes
SHA-256: 29acf488b945eb21d2563f9b264fb53225aae63aa4179944968a9030ccd4df6b
font_01_sfnt_off00006b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4B 9420 bytes
SHA-256: 2fdef0c7af6ce7c741f71febd0a8f40ab7c5a8a50ce05b1ceca5658fc6eb086e

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