Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89cb7d6c53b40df…

MALICIOUS

PDF

48.7 KB Created: 2020-09-02 23:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d95abeb4edff0868b2c271329396ff9b SHA-1: 87e11d9e24368072a4dc5bef0d377c55c0122e43 SHA-256: a89cb7d6c53b40df73ab3df80c44e183906c6b784dbfb043710a88688a783a8e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link to 'ttraff.com' is identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Bike sales app android', suggesting a lure. The presence of a malicious redirector indicates an attempt to lead the user to a harmful destination, likely for further exploitation or credential harvesting. No scripts were extracted from this sample.

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/wix?keyword=bike+sales+app+android
    • https://cdn.shopify.com/s/files/1/0439/5050/6142/files/difodobakuzuzitibil.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/76754753082.pdf
    • https://cdn.shopify.com/s/files/1/0440/1286/3638/files/28445443620.pdf
    • https://cdn.shopify.com/s/files/1/0433/4675/5734/files/senebawis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/kixuwitedabote.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5103/files/maburifeletowigosozufujux.pdf
    • https://cdn.shopify.com/s/files/1/0437/2047/4779/files/big_brother_season_9.pdf
    • https://static.usrfiles.com/ugd/b8c837_846b09febf96493084f20af08920a2be.pdf
    • https://static.usrfiles.com/ugd/b8c837_209cea2bae7245a0a6236b62b357853e.pdf
    • https://static.usrfiles.com/ugd/d4da64_de486ec3f63a45a3af1a6a082885cd9e.pdf
    • https://static.usrfiles.com/ugd/7198c1_7a1ee8665d8f4fa3a4fa09b15b74e38e.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_9f3680fd1ef54147a62fb00f452aedf4.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/klasifikasi_bivalvia.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/world_almanac_2019.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/codycross_answers_group_55_puzzle_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/0341/2633/files/al_quran_latin_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.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_off00008171.bin
edb2f7ad5ffbdb934c52ade39d52d4610f5793fee217359c3aeab850a567ebd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8171 5064 bytes
font_01_sfnt_off000092bc.bin
d786ab901180d3d3b46d1a5e0d4ab76ee0caf93f2f9d605c462ee99e4ad12a26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92BC 10504 bytes

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