Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f578dee0de8d7fc…

MALICIOUS

PDF

52.0 KB Created: 2020-08-09 10:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af668bf4473806dd2d8de19534beb792 SHA-1: 5ff8cd42794e4584d7cfaeff08b98591582e55ec SHA-256: 0f578dee0de8d7fcb78e819da99ef815df7f7e53cd878729d6812be79a482c04
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector service, which in turn leads to a malicious URL. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'alienated labor'. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=alienated+labor+pdf
    • http://juweduw.meadowhealing.com/uploads/1/3/1/3/131383483/wonawajapared-sawalobu-mewezatij.pdf
    • http://dimeluvev.gtmhic.com/uploads/1/3/1/8/131871390/3fe58a854801b5.pdf
    • http://files.stefanietoneygraeter.com/uploads/1/3/2/3/132303041/rovir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7140/5222/files/oblivion_piazzolla_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0439/3422/0456/files/67095919138.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/sap_bpc_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/50129725528.pdf
    • https://cdn.shopify.com/s/files/1/0433/1444/6489/files/english_advanced_vocabulary_structure_practice.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2635/files/nugixemekinulusoduf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0593/4757/files/height_conversion_chart_feet_to_cm.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/3923127097.pdf
    • https://cdn.shopify.com/s/files/1/0454/4344/8990/files/anemia_no_regenerativa_perro.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2454/files/cluster_sampling_vs_stratified_sampling.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sigejorivuzogekos.pdf
    • https://cdn.shopify.com/s/files/1/0434/3965/3030/files/pseudo_aromaticity.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9584/files/20545802138.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_off00009090.bin
fcbfeb980b4885ca6e19e6426d41d43c9f14bc078364a0922642d25422bae37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9090 4984 bytes
font_01_sfnt_off0000a18f.bin
9c4b8458e6937213fe96a3b9c1c2d7ae5976b53b7d1bc7c86d214fe448f3dff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA18F 9868 bytes

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