Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5bdefd4c4cd1b3…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 14:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 270e74c2b64bd6e3ac3ed1bd4d160a2e SHA-1: ac86012b9c5a816cf47e62b28d58c3c823326ddd SHA-256: 6a5bdefd4c4cd1b30003ad9f49713cb290d236caf0d2fe0cb7437ad7f9ed58b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One prominent URL, https://ttraff.com/wb?keyword=come%20comprimere%20file%20pdf%20su%20mac, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a coordinated effort to drive traffic to malicious infrastructure. The ML classifier 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/wb?keyword=come%20comprimere%20file%20pdf%20su%20mac
    • http://xegalon.bikithikit.com/uploads/1/3/0/9/130969204/moxenuvafigazedu.pdf
    • http://files.helenissocial.ca/uploads/1/3/1/3/131383483/wovolekafama_jafijug_nazadafinobe.pdf
    • http://files.fryeins.com/uploads/1/3/1/4/131453615/vogake.pdf
    • http://files.dresscodecracker.com/uploads/1/3/2/7/132710748/6264954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdf
    • https://cdn.shopify.com/s/files/1/0436/0926/0190/files/rojazafij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/lovufididix.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/resalunapemuxerezawoveb.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7641/files/99149265319.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/ikea_kitchen_cabinet_sizes_uk.pdf
    • https://cdn.shopify.com/s/files/1/0437/2247/3624/files/basic_english_grammar_third_edition_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0447/1295/1961/files/kenmore_400_dryer.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/chemistry_textbook_class_12_gseb.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3298/files/importancia_de_los_buenos_habitos_alimenticios.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/valanaraburefizuludaf.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_off000065d2.bin
5c8b824c3f06544d5cc38c1b2ef395f7d7d8453f54eb2f19cae1c85be59abfd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D2 5208 bytes
font_01_sfnt_off0000776f.bin
6a387a3de3cb83fc2d463cb617e35b2c78ad95528c558cf6d8a43f5dcab8f892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776F 10048 bytes

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