Malicious PDF — malware analysis report

Static analysis result for SHA-256 77abf3ffe3e74a80…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 14:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4302f8d2425e5849834b4c509f5dcb5c SHA-1: 843b6855ba40f32e655d5167365164e3a93b6ab5 SHA-256: 77abf3ffe3e74a8085acd28a2419408f688f948fa468b7ad5845d398a67be327
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results, with the primary link directing to a redirector known for malicious activity. The document body, though heavily obfuscated, contains text related to 'Cengage maths calculus pdf download' and a malicious URL, suggesting a lure for users seeking educational materials. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm strategy to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.cc/pify?keyword=cengage+maths+calculus+pdf+download
    • http://tabujume.homeinspectoralbuquerque.com/uploads/1/3/1/4/131453494/8239776.pdf
    • http://files.flos5dollarhouseofbling.com/uploads/1/3/0/7/130739772/3913946.pdf
    • http://files.toprodbassmasters.com/uploads/1/3/0/7/130775245/5572541.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/galupasogumumanebuniwore.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6983/files/perikelab.pdf
    • https://cdn.shopify.com/s/files/1/0429/1523/3948/files/daparovamuruj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/44956890172.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/70637444462.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1520/files/zaxol.pdf
    • https://cdn.shopify.com/s/files/1/0437/5566/7605/files/america_vs_chivas_live_streaming.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1189/files/lyman_reloading_manual_49th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/17221671038.pdf
    • https://cdn.shopify.com/s/files/1/0438/7163/3563/files/hidden_colors_2_the_triumph_of_melanin.pdf
    • https://cdn.shopify.com/s/files/1/0436/9275/3049/files/statics_and_strength_of_materials.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/lupoxonuronolefo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7423/9129/files/6280205465.pdf
    • https://cdn.shopify.com/s/files/1/0447/8458/2813/files/97021685600.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063cc.bin
9f73081ce233d48aacb5b5026d94d77740894ef9df6828514807aef28a82ad8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63CC 5472 bytes
font_01_sfnt_off00007653.bin
f9c76734b4fba9b501f6b521357a9f441e2f1995c845f1bdc58e75ea5c8b2975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7653 10740 bytes

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