Malicious PDF — malware analysis report

Static analysis result for SHA-256 87edf2bef38042e2…

MALICIOUS

PDF

44.8 KB Created: 2020-08-24 20:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f476d5450723ab8831551afef863bcda SHA-1: 871ef3032dfd4ae988f7e643b3a33dc4d1c660d5 SHA-256: 87edf2bef38042e2cacb2db7b6fbf2f370e00851c0c1b984d5b29c6cd81ba242
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=football+live+tv+app+android', is identified as a known malicious redirector. This suggests the document is part of a link farm or phishing campaign designed to redirect users to malicious sites. 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.ru/pify?keyword=football+live+tv+app+android
    • http://jikad.cafeteriakidstheater.org/uploads/1/3/1/4/131454165/tibet_soxapebu.pdf
    • http://files.carolenapier.com/uploads/1/3/2/6/132680784/8695518.pdf
    • http://files.pippaspilatesstretch.com/uploads/1/3/1/3/131398188/nowoxaxopexabafekewu.pdf
    • http://tarexegeg.kmblaw.com/uploads/1/3/0/8/130874493/rozitofaxifu_lizizadazo_nosavedosiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/7872/7318/files/36207054883.pdf
    • https://cdn.shopify.com/s/files/1/0434/6940/6360/files/icao_annex_14_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/sales_and_marketing_cv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/peguwaxafagedowojinuzofok.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2479/files/buretadaxapop.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/aisin_oil_pump_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0432/8685/5840/files/17145433590.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93880590480.pdf
    • https://cdn.shopify.com/s/files/1/0438/2402/1664/files/medicare_part_a_application.pdf
    • https://cdn.shopify.com/s/files/1/0438/0668/7394/files/all_formulas_in_microsoft_excel.pdf
    • https://cdn.shopify.com/s/files/1/0434/6436/0100/files/jiposabikujek.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9600/files/rugokelisabakimetezapi.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_off00007314.bin
bf61b4018a56fa4231240db0352a849c492def9c9b259f1680c2e1dda2096e11
pdf-font-stream PDF embedded font (sfnt) at offset 0x7314 4928 bytes
font_01_sfnt_off000083e8.bin
40ffd3ee3b3c5a376a9da90a6ab08251783703d0ac803bd8e010091a95b443c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x83E8 10048 bytes