Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a163d09e70e48d…

MALICIOUS

PDF

52.9 KB Created: 2020-08-14 06:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 348dc6c239ffd685dc1ebae37334bb05 SHA-1: 86dee7ae11a47ac8bcb6c5bfd38c338e6d563d5f SHA-256: 20a163d09e70e48d9bb5a897171d2cef660431b0635766ef045ed42e50dca88d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The primary malicious URL is https://ttraff.cc/pify?keyword=educating+psyche+reading+passage+2+answers.

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.cc/pify?keyword=educating+psyche+reading+passage+2+answers
    • http://files.ebenezerschools.com/uploads/1/3/0/7/130775665/fuzajizimena.pdf
    • http://jizewibo.matthewpknowles.com/uploads/1/3/1/4/131407406/gisoloxowelo_boxoda_mewugonibitofi_zajibewijigeg.pdf
    • http://files.alwayshelpful.org/uploads/1/3/1/4/131455621/wodopenuzunolil-zakejawove-wopak.pdf
    • https://cdn.shopify.com/s/files/1/0431/1003/9719/files/puzulinemitipop.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0168/files/urbanisasi_di_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1475/files/carmina_burana_score.pdf
    • https://cdn.shopify.com/s/files/1/0437/2434/1400/files/kixol.pdf
    • https://cdn.shopify.com/s/files/1/0438/4319/0944/files/english_grammar_rules_for_competitive_exams.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/robofowi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/49272157737.pdf
    • https://cdn.shopify.com/s/files/1/0433/9531/7911/files/zetegomet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/kudov.pdf
    • https://cdn.shopify.com/s/files/1/0435/9487/5039/files/anticonvulsants_classification.pdf
    • https://cdn.shopify.com/s/files/1/0431/7056/2209/files/85078594879.pdf
    • https://cdn.shopify.com/s/files/1/0428/2236/9446/files/pdf_all_quiet_on_the_western_front.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_off0000910b.bin
c7cbb9308d5279329b958472f3ad405542d0912facc8483048bfe5561f9f9d0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x910B 5584 bytes
font_01_sfnt_off0000a419.bin
3c9dac29c2abc348266cef1953d6c02bbf98e3049f67f9c7b6e6035bf98db7a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA419 9988 bytes