Malicious PDF — malware analysis report

Static analysis result for SHA-256 031b7c6a61406f4a…

MALICIOUS

PDF

32.1 KB Created: 2020-09-17 00:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d145305fe46768ff867abb680f08511 SHA-1: a1e9c6205bf0550c619e5be8ea58fea0c1ea4d51 SHA-256: 031b7c6a61406f4a2041baf935787a1ca695be53b1e98981d72d75b8b945017d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier also strongly indicated maliciousness. The primary goal appears to be directing users to external, potentially harmful websites, possibly for SEO poisoning or phishing.

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.me/wix?keyword=imax+b6+manual+romana
    • http://rulujig.aq-usa.com/uploads/1/3/1/3/131379246/nopokozelobudum.pdf
    • http://files.topofthepodium.org/uploads/1/3/2/8/132815748/soput-fuvakujituguno-figumuzirijujo-puxuwubazub.pdf
    • http://files.livewellcrawfordcounty.org/uploads/1/3/2/7/132710756/8b9c682c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2447/4531/files/jawapabobusolodirafomad.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/28534933272.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7288/files/54532381986.pdf
    • https://cdn.shopify.com/s/files/1/0440/3891/4213/files/75522884579.pdf
    • https://cdn.shopify.com/s/files/1/0436/6457/2569/files/72216747146.pdf
    • https://cdn.shopify.com/s/files/1/0437/6798/8376/files/19237077145.pdf
    • https://cdn.shopify.com/s/files/1/0431/0689/3985/files/free_personal_budget_template_excel_2007.pdf
    • https://cdn.shopify.com/s/files/1/0438/0613/0337/files/denotation_vs_connotation_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6272/1688/files/6130631649.pdf
    • https://cdn.shopify.com/s/files/1/0449/6916/4968/files/dizesojevunarupubexat.pdf
    • https://cdn.shopify.com/s/files/1/0462/4849/3205/files/jajujibup.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/vekunerubusa.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/melarusakadus.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_off00004320.bin
37d3c27e2ae67a648097213a722a676213648a9244cce4799fc74e38233bb0d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4320 4952 bytes
font_01_sfnt_off000053e3.bin
c8db46d1fe3b0241f2dea8091299fc1888bdf4582259f71c6c2d9776d6f8c921
pdf-font-stream PDF embedded font (sfnt) at offset 0x53E3 9368 bytes