Malicious PDF — malware analysis report

Static analysis result for SHA-256 08907d24a4bacd2c…

MALICIOUS

PDF

41.8 KB Created: 2020-08-19 21:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 357ecb992ac428c0b4ecbb2ecd79801d SHA-1: 330014dfe0b78265d6bfed7adaa78eed124bb5c6 SHA-256: 08907d24a4bacd2cf0d6e30edbdc73148eb3cea182accfed1c48ba05e23811c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically disguised as a Cisco configuration guide. The document body also contains this URL, indicating an attempt to trick the user into clicking it. The presence of numerous other PDF links suggests a link farm, likely for SEO poisoning or to host further 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.com/pify?keyword=cisco+6500+bgp+configuration+guide
    • http://pegex.calhounmiddleschoolband.com/uploads/1/3/1/3/131379685/nefilesitibu.pdf
    • http://jutadup.ctumber.com/uploads/1/3/0/7/130775403/ronibezog-wefag-dogiwomopuraga.pdf
    • http://lineji.cashforgoldwc.com/uploads/1/3/0/8/130813848/8461098.pdf
    • http://nikobewa.spartanswolvesfc.com/uploads/1/3/0/8/130873995/zawujolodopu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9531/6896/files/ncert_books_for_class_11_maths_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/4202/8182/files/51172278853.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/tahm_kench_voice_lines.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/25819511260.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0885/files/uvi_aquaponics_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/1081/7180/files/understandable_statistics_12th_edition_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0450/8601/5640/files/chemistry_notes_bgcse.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/xutebemanowawilob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.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_off00005dfa.bin
5dd3aae8ee9d2895410e23825d2f7ae75a3e8b14454780e36e895f7e8ce66538
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFA 5756 bytes
font_01_sfnt_off0000718e.bin
29bffc0b6d75e500b579a2d839dac7dc5adac620cb228a7d9c2370b91922fdfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x718E 12860 bytes