Malicious PDF — malware analysis report

Static analysis result for SHA-256 1754087dcf6b1ee9…

MALICIOUS

PDF

39.4 KB Created: 2020-08-16 02:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cb789b54693147e576d0b71e77e519a SHA-1: 31d0377816674aebf70205f669de5098211c3587 SHA-256: 1754087dcf6b1ee9b87c3f22b86346a8e13c78fca1bcf49b23e1ba3a264e9ace
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. This suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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/wb?keyword=mots%20fleches%20debutant%20pdf
    • http://files.ratliffind.com/uploads/1/3/0/7/130776096/795b7ce9175b.pdf
    • http://files.mrgauronroom.com/uploads/1/3/1/3/131380345/jelojak_posagumivo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7630/5564/files/zumiwutumuze.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/16732646557.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2504/files/free_printable_coloring_sheets_of_dogs.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/program_technician_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2657/files/bytecode_viewer_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/4488/6945/files/safizakuvigevakupejesa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/sazipirexajujeren.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/darkest_dungeon_crystalline_foci.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.pdf
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/50498135577.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1496/files/85858288960.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/83506842308.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.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_off0000582c.bin
bfa6fe87a5a152b704f79dc165bbc1fcb22df403919ff64af03fe5446c213dd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x582C 5292 bytes
font_01_sfnt_off00006a32.bin
12dca941db836469de68b7d5d14c091c5446c735550ebce01c63dd2afa783a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A32 11720 bytes