Malicious PDF — malware analysis report

Static analysis result for SHA-256 876aa28fe46b15a5…

MALICIOUS

PDF

35.3 KB Created: 2020-08-10 09:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c2832c987d0d2ddc2fbf4784535e328 SHA-1: b9173cc1c2ae20dc4ca2eafb12868a9a5455e982 SHA-256: 876aa28fe46b15a5784952d4043082a67794bb245b6778d5b71511f17f4e3621
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to external PDF files hosted on various domains. One URL, 'https://ttraff.com/pify?keyword=single+variable+calculus+early+transcendentals+8th+edition+pdf+reddit', is flagged as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a potential link farm or content distribution network for malicious files. The ML classifier also strongly indicated maliciousness.

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=single+variable+calculus+early+transcendentals+8th+edition+pdf+reddit
    • http://files.thedevilsdispatch.com/uploads/1/3/1/4/131453823/2832597.pdf
    • http://files.thogersenfamilyfarm.com/uploads/1/3/1/4/131453076/8812353.pdf
    • http://tolirawen.susanbutlerhursonmd.com/uploads/1/3/1/0/131070718/7826433.pdf
    • http://files.ogilvies.scot/uploads/1/3/0/8/130873822/3082025.pdf
    • http://gepeju.lambertvilleumc.org/uploads/1/3/1/3/131383771/bomimaroxudi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8028/5348/files/28451779131.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/carcinoma_papilifero_tireoide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/lozemujivav.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/fesodawofab.pdf
    • https://cdn.shopify.com/s/files/1/0436/6286/8633/files/83718705680.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/32233189059.pdf
    • https://cdn.shopify.com/s/files/1/0431/1040/0153/files/waiting_for_godot_book_act_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/8051/4726/files/ma_urdu_books_free_download_part_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/dantdm_five_nights_at_freddy_s.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/40866916530.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_off000047fc.bin
cf0e3290199485bf9597e4cec626e3c7a07f5230feb236ec2ae3efe37fe155bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47FC 6016 bytes
font_01_sfnt_off00005c78.bin
b9d6dca7f6d5293792d94bcd3ec9f1699b32ea2b5b07947f786afde1d9c7922d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C78 10240 bytes

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