Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2b8f0c68ee40ec…

MALICIOUS

PDF

42.8 KB Created: 2020-08-01 05:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6775720fbe0969ff6e7b80b2ebbf68a SHA-1: 75bed034e49153c18dd9add4b50c02be3b0aa97a SHA-256: 1b2b8f0c68ee40ecd9061171ff6aed8d70353f0b0063f0133c7804b9b86b5b84
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and heuristics indicate it contains a large number of external links, forming a link farm. One of these links, 'https://ttraff.ru/pify?keyword=wheelock%2527+s+latin+pdf', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure users to malicious sites.

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=wheelock%2527+s+latin+pdf
    • http://files.feipol.us/uploads/1/3/1/4/131453432/7ed1646abdafe1.pdf
    • http://files.milothaimassage.com/uploads/1/3/1/4/131406781/7613334.pdf
    • http://files.travellifegoal.com/uploads/1/3/1/3/131379980/zidowuxar_zawabibaxupugen_polujirajesixas_mixurij.pdf
    • https://cdn.shopify.com/s/files/1/0440/9799/4904/files/sijolokobetutiwitorigotit.pdf
    • https://cdn.shopify.com/s/files/1/0434/8064/5782/files/77661567567.pdf
    • https://cdn.shopify.com/s/files/1/0440/6326/0822/files/ferixufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5118/files/vapatutofemedevus.pdf
    • https://cdn.shopify.com/s/files/1/0437/6032/0663/files/powetizawaxux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62092070186.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29883534071.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/76008797542.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/pinabefevamapixomosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15636630427.pdf
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/path_if_exile_fearless_cheat.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b6.bin
75937c9235b9c139ce1d4605b19ff5416d80c6fcdb527bfc2bb8d2b90a53d885
pdf-font-stream PDF embedded font (sfnt) at offset 0x68B6 5260 bytes
font_01_sfnt_off00007ab1.bin
e5540ca62bd05d6816fe5446f1baaceacb670ce488c5113f832eb1604ab56cbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB1 10556 bytes