Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2b78eace083ce9…

MALICIOUS

PDF

57.9 KB Created: 2020-08-09 22:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 283b73bc455b42c98942d8e9185d6f93 SHA-1: 55ec4b1aeb114192afa6a5f91fdedce198e95567 SHA-256: 2d2b78eace083ce9be902531278647b2e8d273cd88b337ae22cf993119fcb7b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to appear as a solutions manual download, but it redirects to a malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and embedded links clearly indicate a phishing or redirection attempt.

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=chemistry+a+molecular+approach+3rd+edition+solutions+manual+pdf+download
    • http://loranoxi.lyonsvolunteers.org/uploads/1/3/0/7/130776485/5332949.pdf
    • http://files.muddyfaith.blog/uploads/1/3/1/4/131453429/xadufuv.pdf
    • http://files.mcafeeartroom.com/uploads/1/3/0/8/130813650/bijokuz_jokozilura_fekagukafulu.pdf
    • http://files.buckhillcoffee.com/uploads/1/3/0/9/130969183/movexetiwe.pdf
    • http://files.kaskaskiacountryclub.com/uploads/1/3/1/4/131407388/3637775.pdf
    • https://cdn.shopify.com/s/files/1/0433/0517/3147/files/male_shrug_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/nobesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3751/files/14259482827.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/tujebumatapevapijelaxemo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5004/files/miller_furnace_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1438/files/40098988628.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/sisudewa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/96996022155.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/99943303417.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7303/files/alfa_laval_pump_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/59984238462.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a107.bin
eacf69bcceb9f3444230b251131bbbd7b789ccd04886c02da7add80fd10be577
pdf-font-stream PDF embedded font (sfnt) at offset 0xA107 5660 bytes
font_01_sfnt_off0000b42b.bin
5f1068448003975e35f27dcadfe513d29a821468ef2229465c8400a0d382d138
pdf-font-stream PDF embedded font (sfnt) at offset 0xB42B 11084 bytes