Malicious PDF — malware analysis report

Static analysis result for SHA-256 6794e69aa1e9c1bf…

MALICIOUS

PDF

45.0 KB Created: 2020-08-03 11:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 379221f7c586879bdd358978892e572b SHA-1: 35478e8b7b44a34dab4c5eed27b37d2a810948ac SHA-256: 6794e69aa1e9c1bf6d93c2ea03cd519dd59f4b34f74c9ea220b5cde9ebe330d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malware through a link farm. The primary malicious URL identified is https://ttraff.ru/wb?keyword=ingenieria%20de%20software%20swebok%20pdf.

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/wb?keyword=ingenieria%20de%20software%20swebok%20pdf
    • http://files.lose-weight--faster.com/uploads/1/3/2/6/132695576/megasurufaz.pdf
    • http://files.foxmanager.co.uk/uploads/1/3/0/7/130775465/8784456eaecb.pdf
    • http://files.beyondaspectrum.org/uploads/1/3/1/4/131437276/lolelovafederum.pdf
    • http://files.mysunnysummer.com/uploads/1/3/2/6/132695915/3a6b20b853.pdf
    • http://files.sonianowicka.com/uploads/1/3/1/3/131398094/bosamugex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/lebejefibezofa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/quad_laser_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/lutune.pdf
    • https://cdn.shopify.com/s/files/1/0435/9821/7374/files/popetitesuwodegomakiwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/narovoze.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1879/files/sadozitiranavosabevuzape.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/96363542273.pdf
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/fagojiweleguvevax.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3877/files/gesibemogakaxab.pdf
    • https://cdn.shopify.com/s/files/1/0431/7190/5698/files/12697595971.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/66840817761.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_off000070a9.bin
d92bd2e85ae44879a857e19f044e2274024aeb39b5f27dbc58541c90228340e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A9 5412 bytes
font_01_sfnt_off00008331.bin
9718d99b698853631df2c3b5898ce1a805a79c14f5e84a18ddfb0f4e4c1aee72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8331 10552 bytes

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