Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ef23ac0e3c9d97…

MALICIOUS

PDF

38.7 KB Created: 2020-08-02 22:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e015e5a23f7615871551ca64a0141aa2 SHA-1: 80ed453f93f67a518a9c270efe7f2216d890b2a6 SHA-256: a3ef23ac0e3c9d971a25da900d821454d1ca2b22daf280394eb235391e197298
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'simulation modeling and analysis solutions manual pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting users through a link farm.

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/pify?keyword=simulation+modeling+and+analysis+solutions+manual+pdf
    • http://files.cbsaimtt.com/uploads/1/3/1/8/131856071/koviwajusujumi.pdf
    • http://files.matrixbathroomsandheating.com/uploads/1/3/2/3/132303118/8899180.pdf
    • http://files.fastflyingmarketing.org/uploads/1/3/1/6/131606486/82636b96817653.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/electrical_labor_units.pdf
    • https://cdn.shopify.com/s/files/1/0433/5697/9351/files/python_sort_tuple.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/xefujunipoziwimiwitufilik.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4241/files/33864313732.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29426312843.pdf
    • https://cdn.shopify.com/s/files/1/0431/1980/4567/files/77771678542.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0789/files/hard_disk_sentinel.pdf
    • https://cdn.shopify.com/s/files/1/0437/5232/5272/files/pikosujali.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2491/files/counter_strike_source_performance_config.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/95937975281.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3655/files/lixavuxewoxinewazel.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/bopopusizurupafobakela.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/19885974463.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b4a.bin
9f42cbac11324b88e9f436a7e12b97a5560b2d89316c54922dd81204e19416ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4A 5352 bytes
font_01_sfnt_off00005d6e.bin
4188ed8dccba87afdd527b89c75a85b0dd9237b4ac44b6dbe7bf722e8ff11239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6E 9956 bytes
font_02_sfnt_off00007f60.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F60 4324 bytes

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