Malicious PDF — malware analysis report

Static analysis result for SHA-256 632da0b44f484bc8…

MALICIOUS

PDF

42.6 KB Created: 2020-08-10 07:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d60aaebd22d800a79605c8238197f9e SHA-1: ade548276a7896fe3fa6ccdcbaafe52ce0a87134 SHA-256: 632da0b44f484bc827c135de1bba793379d3c22e7c81fd4bf7eb4d5b919c31d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=python+graphical+user+interface+tutorial+pdf'. The document body, though heavily obfuscated, appears to contain similar SEO-like keywords and URLs, suggesting a link farm or SEO poisoning tactic. 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.com/pify?keyword=python+graphical+user+interface+tutorial+pdf
    • http://files.saddlepeakproperties.com/uploads/1/3/0/8/130874521/0b83b111f8ae4a.pdf
    • http://files.healingartsofthesouth.com/uploads/1/3/1/4/131483002/4836768.pdf
    • http://jugalazi.nasiiclothingstore.com/uploads/1/3/1/6/131637016/6414532.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/4600/8982/files/java_arraylist_initialize.pdf
    • https://cdn.shopify.com/s/files/1/0450/4377/7694/files/carmina_burana_partitura.pdf
    • https://cdn.shopify.com/s/files/1/0436/8000/6294/files/56327563634.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/pugatad.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/73004230038.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/56119941878.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/nafuzokezewewajovazuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/8164/4697/files/sim_2_double_deluxe_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/21245686284.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8062/files/greenhouse_gases_sources.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5562/files/80038681865.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/68045697720.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/lazidefajaxunivotevuwuret.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b0e.bin
c65234cffdb50746ef40b7ac0123496c62eead45ce4ad8764a578291a17f41e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0E 5404 bytes
font_01_sfnt_off00006d65.bin
4d79920379806834ec7e1feb2ef03d778ac1eb4194299d95bf334b75c43cfb54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D65 9856 bytes
font_02_sfnt_off00008f26.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F26 4324 bytes

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