Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb2aedfd163f49f…

MALICIOUS

PDF

37.7 KB Created: 2020-08-10 08:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80ad23bb316a7b6193fc7eb78e733361 SHA-1: ea74f2a253b99eda30de2f3a41f309528c5d191e SHA-256: 5eb2aedfd163f49f892de040cd8726d974c99d0f321aca1872c182b76b12a80a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious URL identified is https://ttraff.ru/pify?keyword=algorithms+sartaj+sahni+pdf, which is flagged as a malicious redirector. The document's structure suggests an attempt to disguise malicious links as legitimate academic content to trick users into visiting them.

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=algorithms+sartaj+sahni+pdf
    • http://zosotaze.dustyart.com/uploads/1/3/0/7/130775735/babexarigazep.pdf
    • http://files.sozesty.com/uploads/1/3/0/9/130969634/suterapagiviwitot.pdf
    • http://files.hometowncreationsllc.com/uploads/1/3/1/4/131406893/vixogokiwe.pdf
    • http://files.nicholasryankelly.com/uploads/1/3/0/9/130969820/7000084.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7376/3496/files/5557193503.pdf
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/73324044310.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/97787310080.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/guwikojozolofadido.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/73392507155.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/bukabipivixifowu.pdf
    • https://cdn.shopify.com/s/files/1/0447/5971/1898/files/apprendre_le_franais_cp_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1741436775.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/23815717415.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1369814796.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6221/files/sawazov.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_off00005561.bin
4d25caec4c2c3f223f87336930fa7f79eb84b8bf3feef1dc1d6dda38159c2d07
pdf-font-stream PDF embedded font (sfnt) at offset 0x5561 5520 bytes
font_01_sfnt_off00006808.bin
0144aac8e2312e7b3b26707b3cfc7252d599810d87cd3cc32f336f27380d1c42
pdf-font-stream PDF embedded font (sfnt) at offset 0x6808 10072 bytes