Malicious PDF — malware analysis report

Static analysis result for SHA-256 7258ad8b26126f79…

MALICIOUS

PDF

46.1 KB Created: 2020-08-12 02:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a894d3e9a79d269c6b706609ca46406 SHA-1: b1b5ae523fe0bf54a8ecf54adc9250f271bd55a0 SHA-256: 7258ad8b26126f7900c9487f0329407134cca97c6012f7e022f3437746f6912b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to link farms and redirectors. The primary malicious URL identified is `https://ttraff.cc/pify?keyword=python+machine+learning+book+by+sebastian+raschka+pdf`, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other benign-looking Shopify links, suggesting a social engineering attempt to drive traffic to malicious sites. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate a malicious intent to redirect users.

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=python+machine+learning+book+by+sebastian+raschka+pdf
    • http://files.bcproductions.co.za/uploads/1/3/0/7/130739937/bilubal-kadofox-lodogitixakiti.pdf
    • http://files.orillialakesidedental.com/uploads/1/3/1/4/131407708/4608480.pdf
    • http://files.bethelkidsfw.com/uploads/1/3/1/4/131438461/fukekedubuxire_fawekexenux_niwuda.pdf
    • http://files.vetmedtrail.com/uploads/1/3/1/8/131856645/fa6891b72d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/fafovukexawesidedul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60801944673.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/propionic_acid_derivatives.pdf
    • https://cdn.shopify.com/s/files/1/0435/5345/6289/files/fantasia_models_com.pdf
    • https://cdn.shopify.com/s/files/1/0431/6944/8096/files/51754050043.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1415/files/how_to_remove_a_suggestion_from_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/kevatofosozemezogekuzekak.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0489/files/multiplying_polynomials_box_method_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/5928/0022/files/chaupai_sahib_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4076/files/75982098196.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/50107256946.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/fumalojugagobavo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6630/8246/files/kileremoganobukokikef.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_off0000721b.bin
31a4ec08b1e2809205d6f77ab448e21bbe2f3177efc163a76e4dba2f5d55692e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721B 5876 bytes
font_01_sfnt_off000085e3.bin
a1eef8f53c59dcd8b6e5727196dfa897a41619b8f7af08a14048bed969d68c3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E3 10960 bytes

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