Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bc084331e94cd4…

MALICIOUS

PDF

34.9 KB Created: 2020-08-16 19:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28fa2c16df3ed24346f87285c131254f SHA-1: 3c27c7d34c50fd5a8b75838dd5fac398cca9ac1a SHA-256: b8bc084331e94cd46c53c314e951528d3f1b57e7fc83637ea21d449af2afd4e4
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=guide+vayne+top+s9'. This URL is embedded within the document body, suggesting a social engineering attempt to trick the user into visiting a malicious site. The presence of a large number of external PDF links, many pointing to Shopify domains, indicates a link farm designed to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=guide+vayne+top+s9
    • http://files.constantpodcast.com/uploads/1/3/1/8/131856827/pafemunilov_dununumo_mopemosutirusa_limevasaleragip.pdf
    • http://fukamatid.pembinaparish.com/uploads/1/3/1/3/131384609/popitifefebukadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4330/files/understanding_culture_society_and_politics_grade_11.pdf
    • https://cdn.shopify.com/s/files/1/0430/1016/2837/files/understanding_symbolic_logic_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/98477545889.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5061/files/cercanias_renfe_madrid_plano.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9773/files/surewotusugelupugosipoxij.pdf
    • https://cdn.shopify.com/s/files/1/0434/9024/6822/files/print_labels_from_excel.pdf
    • https://cdn.shopify.com/s/files/1/0428/4085/0598/files/kibilino.pdf
    • https://cdn.shopify.com/s/files/1/0428/7627/2796/files/sexojifebikekalaxin.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/assessment_in_education_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/89849956152.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/motorcraft_oil_filters.pdf
    • https://cdn.shopify.com/s/files/1/0437/6159/8616/files/awadhesh_premi_2019_video_dj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/gmat_preparation.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_off00004e97.bin
940de9cf8e28320f2b99188215134fa6edc8baed61d611470a753632965615a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E97 5172 bytes
font_01_sfnt_off00006053.bin
ee36f0728113772762634451c15a5385b616d19d10af0575f94adb758fe8ea56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6053 9032 bytes

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