Malicious PDF — malware analysis report

Static analysis result for SHA-256 626a1c6270e792a5…

MALICIOUS

PDF

53.6 KB Created: 2020-08-16 01:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf4af618b04185e85d432c702a4852d8 SHA-1: 6732bd792449688ebaf5533cca5656c4598f460f SHA-256: 626a1c6270e792a5be7f322e0517f2d35c238cbd72e7ae738bd29d37d0216fc7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to other PDFs. The document body, though heavily obfuscated, contains the malicious URL and several other PDF links, suggesting an attempt to drive traffic or distribute further malicious content. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly indicate a malicious intent to lead users to harmful sites.

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=android+16+dragon+ball+fighterz+combos
    • http://bumijo.maresamflood.net/uploads/1/3/0/9/130969723/papadidor_kurodenigu_fisogosad_juwadi.pdf
    • http://files.simplejoecafe.us/uploads/1/3/1/6/131607662/4350135.pdf
    • http://files.joanadler.com/uploads/1/3/1/1/131163601/dutelaroboluf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/geological_time_scale_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/41214505430.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/99908164553.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/gixijuzakagaxizozevimi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8497/files/famille_des_asteraceae.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/74791060073.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/cahier_exercice_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/69234640294.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6647/files/62652659572.pdf
    • https://cdn.shopify.com/s/files/1/0446/9909/1098/files/burger_king_coupons_juli_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8903/files/serilez.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eb5.bin
46278cae961309ee1e30ae399c5eb0d119cbbb289d0c40414778704b7460ebca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB5 9052 bytes
font_01_sfnt_off00007cbe.bin
5cc9b24af70d224b6e602f6479326a4821cc9e7efba1f80d00325923c1cd06b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBE 5820 bytes
font_02_sfnt_off00009065.bin
92cc52e59e3c417c9bd8dc1a236376bb94277943fff76964f559d7de78ebd44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9065 10396 bytes
font_03_sfnt_off0000b43a.bin
d286e8b4d1cdafc5f769987bdccf7a6368ad55d0d3b8f98fd56bc2ae223999f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB43A 16076 bytes

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