Malicious PDF — malware analysis report

Static analysis result for SHA-256 718ca2b5606bb215…

MALICIOUS

PDF

58.9 KB Created: 2020-08-07 03:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6273372dc980366fc093e9d8f6d265f9 SHA-1: f0f855623eef321ed64c5be28ef053b1075c33ce SHA-256: 718ca2b5606bb2152a79e4a33f8be607420b9fdf4762fc14e09e8e67bcd847e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=aashto+1993+pdf', is identified as a known malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users.

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.ru/pify?keyword=aashto+1993+pdf
    • http://wapel.lbcatwateroh.com/uploads/1/3/0/8/130874359/3985831.pdf
    • http://files.alitheajosaphine.com/uploads/1/3/2/7/132710782/187119.pdf
    • http://files.xlashbyane.com/uploads/1/3/0/8/130874501/rugemulusitukoxaram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9075/6259/files/8601102765.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/98166641345.pdf
    • https://cdn.shopify.com/s/files/1/0429/0599/3375/files/fimigop.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/roland_barthes_theory_of_the_text.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/wuxozaxisapusinaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/mopalageroxupe.pdf
    • https://cdn.shopify.com/s/files/1/0436/8721/5269/files/kim_mele_methow.pdf
    • https://cdn.shopify.com/s/files/1/0434/7281/4245/files/supofusasoseputexoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1336/files/89323024911.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/75740245439.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/45611758409.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_off00009e5c.bin
f1a32d550db2da659c704a3e333840232147dddb437e3946d5a2f961c245e3fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E5C 5360 bytes
font_01_sfnt_off0000b09a.bin
12a60cf5a28573faa4db38fbab05f2341f7845c0e0691f2b0779f5d1546c461c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB09A 14504 bytes