Malicious PDF — malware analysis report

Static analysis result for SHA-256 131ad75c2c363dc7…

MALICIOUS

PDF

34.8 KB Created: 2020-10-25 19:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 215f740be37b8c0681565ca8d0cc1315 SHA-1: 8dcb6ea932849fb320b8315e9e0270df97660aa4 SHA-256: 131ad75c2c363dc75586ef1c24ccc8fb9e3d5c951611435803df436c367b38f1
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. The embedded URLs and the document body's reference to a downloadable PDF indicate an attempt to trick the user into clicking through to potentially harmful content.

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://gettraff.ru/strik?keyword=essentials+of+geology+5th+edition+pdf+download In PDF document text
    • https://mogazikazalag.weebly.com/uploads/1/3/4/4/134440800/wigaxefen.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/ritiniju.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/bupexusarusal.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/8067084.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/wemuwutevovewure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5f8ea4b3532a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f927f4a1c7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f8939cd31ffd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6724/4183/files/4871166662.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8599/7241/files/1279607095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2781/1485/files/52850800963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2963/4970/files/nobafexuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3272/2599/files/dekebusepukututegoxatubop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1794/7296/files/putumayo_colombia_food.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1070/6619/files/wobagipizavavorofipopava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/71255781238.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/7231/6326/files/prache_anti_aging_cream_free_trial.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/oxford_dictionary_english_to_urdu_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/78599625509.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_off0000470e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x470E 5480 bytes
SHA-256: b3f953b0e4e54da83949be688c52ca1787e634b66e97605ade2f118b46296e60
font_01_sfnt_off000059ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59CE 10284 bytes
SHA-256: 9dabf92031b9fe9b748513f6303efb7eb1b5cd4487f73c80e6634db27d9ccff1

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