Malicious PDF — malware analysis report

Static analysis result for SHA-256 5525274ac198cf32…

MALICIOUS

PDF

43.9 KB Created: 2020-08-04 13:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c938ca8ed69f35cd11a6bcc81c3beb82 SHA-1: f11daf022516bed3b4ad1ffcf8163456c60a447f SHA-256: 5525274ac198cf32973cc20551d7db051a3982a92398df6ede0b591d75ba3871
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links, many of which are part of a link farm hosted on Shopify. One of the primary links, 'https://ttraff.com/pify?keyword=tax+on+salary+in+cambodia+2020+pdf', points to a known malicious redirector. The document body contains garbled text but includes the same URL as the malicious link, suggesting a lure related to taxes or salary information. No scripts were extracted, but the extensive use of redirectors and link farms indicates a phishing or malicious content delivery 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.com/pify?keyword=tax+on+salary+in+cambodia+2020+pdf
    • http://files.samanthagottlich.com/uploads/1/3/0/7/130775245/6742c5.pdf
    • http://files.nailandbeauty.co.nz/uploads/1/3/1/4/131411688/b8d640c79.pdf
    • http://wuzov.robertmeyerlaw.com/uploads/1/3/0/8/130813577/3824579.pdf
    • https://cdn.shopify.com/s/files/1/0429/5062/3385/files/niwijodesiko.pdf
    • https://cdn.shopify.com/s/files/1/0429/4334/8892/files/30376767198.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/nomuturakevevabura.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/9662634780.pdf
    • https://cdn.shopify.com/s/files/1/0432/0703/2990/files/27954179116.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/allis_chalmers_wd_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/minecraft_64_bit_java.pdf
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/travel_agency_business_plan_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0432/2040/2343/files/65834870584.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/learn_english_language_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9295/files/applied_linguistics_and_english_language_teaching.pdf
    • https://cdn.shopify.com/s/files/1/0431/5414/5444/files/iteration_vs_recursion.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/
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/minecraft_64_b

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b9c.bin
332aa384406336c1155d1922abd7589d5dc90a2dbad4ea33e3ccd560965a79e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9C 5836 bytes
font_01_sfnt_off00007f6c.bin
644975767a512e503e20b86bdcc891d7923bae86f8123dda62d056ff36ea5c80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6C 10236 bytes

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