Malicious PDF — malware analysis report

Static analysis result for SHA-256 1851231ae6a512ab…

MALICIOUS

PDF

67.1 KB Created: 2020-08-14 19:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec5d5485cfed6aa5da6c74b3d6c409b1 SHA-1: 7a67c724e6517fa86cd053001a175c7b53a9cdf3 SHA-256: 1851231ae6a512abd84a3eef964bd737593cb699c5bc338503e643e9c9d0dcce
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a worksheet download, which is a common social engineering tactic. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm designed to distribute malware or phish users. While no scripts were extracted, the PDF structure and embedded malicious URL are sufficient indicators.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=anxiety%20coping%20skills%20worksheet
    • http://files.fernleyrepublicanwomen.com/uploads/1/3/1/4/131453284/9980529.pdf
    • http://files.oryxestollers.com/uploads/1/3/0/7/130738903/wudomotum-punurazorowatuj-pavez-rafodenasur.pdf
    • http://files.southbaywoodworkers.org/uploads/1/3/1/4/131407178/rinokewokowebawili.pdf
    • http://files.positiveposturenz.com/uploads/1/3/1/4/131483550/sivaf_polatafi_zuwovil.pdf
    • http://files.terindahestate.com/uploads/1/3/0/7/130776619/5aaeddff9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/walking_dead_comics_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/tuviburor.pdf
    • https://cdn.shopify.com/s/files/1/0430/2772/6489/files/8967212484.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6918/files/mutalexikalaxalode.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/restart_ssh_mac.pdf
    • https://cdn.shopify.com/s/files/1/0436/9380/1625/files/90397853394.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4295/files/23181525703.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/emergency_treatment_of_hypertension.pdf
    • https://cdn.shopify.com/s/files/1/0434/5243/2537/files/jardin_l_encyclopdie.pdf
    • https://cdn.shopify.com/s/files/1/0433/5573/4166/files/76906893459.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/lilly_pathophysiology_of_heart_disease.pdf
    • https://cdn.shopify.com/s/files/1/0428/8774/1599/files/28444181654.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40313354442.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_off0000ca3e.bin
fe7c1964c842096c0c084bb0ac719890e30dc9b55c2e942019ec8b71506b2c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 5300 bytes
font_01_sfnt_off0000dc5e.bin
bbf16063bbbdd42c3d560c1bff75bf141b6f4a666eb2e382a949523ecdaf4e6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 10120 bytes

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