Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0263031da8f9f6f…

MALICIOUS

PDF

62.1 KB Created: 2020-08-09 18:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a52545b1d42e33b0c7fd7ff867cba45 SHA-1: 138dc380ba1cc29761acf6efe59f0bb51cc2f139 SHA-256: a0263031da8f9f6feddedff1459c211a8b2c0ac1672beb95fc9aac2d670658ca
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a large number of external PDF links, forming a link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=libros+de+augusto+roa+bastos+pdf, which is likely used to redirect users to a phishing or malware-hosting site. The document body contains obfuscated text and a reference to the malicious URL.

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=libros+de+augusto+roa+bastos+pdf
    • http://files.tyrendarraagriculturalshow.com.au/uploads/1/3/1/8/131856446/demumesegafudu_wikuzow_tifizu_papafewekib.pdf
    • http://files.teamwinfrey.org/uploads/1/3/0/8/130874633/sixodedimasijoribiru.pdf
    • http://files.artfromalice.com/uploads/1/3/1/4/131438464/vaxapokuwevew_semovefexike_bozutek.pdf
    • http://files.devihealing.com/uploads/1/3/0/9/130969985/nipagalaxedumazusoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/82647017789.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/93837352220.pdf
    • https://cdn.shopify.com/s/files/1/0438/1471/5549/files/sc_caste_list_in_karnataka.pdf
    • https://cdn.shopify.com/s/files/1/0435/4670/6088/files/gofaxaxideja.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/2510107703.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6910/files/52448739001.pdf
    • https://cdn.shopify.com/s/files/1/0439/6027/1006/files/collaboration_diagram_for_college_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/8048/2970/files/kegedi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/40355327448.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufalelavajukunegaxiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/wuzoniripavonuzujibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7673/8462/files/13987035884.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_off0000b335.bin
228ab3be27c40cb283a4515f41f31258684d596eccbdf572a1e1f2f29881a292		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 5260 bytes
font_01_sfnt_off0000c521.bin
a06d7662534d287f6de87c5e22c8f1e26f5abd4d842040e90e157b70d13b6d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC521 11312 bytes

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