Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88e4b78cf3f7134…

MALICIOUS

PDF

34.2 KB Created: 2020-08-30 14:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2776c7938f5e49111085e713f9387884 SHA-1: cec7cc9ee314cb17c0bd263aad04799cafc6107d SHA-256: e88e4b78cf3f7134dc30a7cf2bb76c5cb04ac6c25311c67bcf6e354a2b1831a1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'South western federal taxation 2017 pdf' and the malicious URL, suggesting a phishing lure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=south+western+federal+taxation+2017+pdf
    • https://cdn.shopify.com/s/files/1/0454/7146/5630/files/jetugilawuwurigo.pdf
    • https://cdn.shopify.com/s/files/1/0439/7491/8302/files/dadugifopuwixikaxixese.pdf
    • https://cdn.shopify.com/s/files/1/0437/4714/7928/files/vavunosisajefuba.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3267/files/palabras_basicas_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/zoroxukugomeremimekovalom.pdf
    • https://static.usrfiles.com/ugd/de65f7_2c4c053eb8e04ee8a1dec5799dd5ba1d.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/sonevepolariridotivujiku.pdf
    • https://cdn.shopify.com/s/files/1/0436/4845/0718/files/32356525433.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/ratixawaxutesifivef.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6361/files/67765522057.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/vitoxetagosuxipewiwar.pdf
    • https://cdn.shopify.com/s/files/1/0435/4369/1419/files/xivipilawanoxotij.pdf
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/best_trucker_gps.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_off00004655.bin
0d3e8407a1e26658f6a7273fcbaaf988daddf176de60c087f8121c267c582abb
pdf-font-stream PDF embedded font (sfnt) at offset 0x4655 5800 bytes
font_01_sfnt_off00005a29.bin
e341902b500cf081c4b1126318d0a6c3e07d21d4d9e8c40d8a2f32beaf3c4046
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A29 9960 bytes