Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52ec48e5553cae5…

MALICIOUS

PDF

42.0 KB Created: 2020-08-06 05:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23df6135a8f9015ba45252b3c1466344 SHA-1: 081e838b85eaf632bf1d91c48595bb823ad27d2b SHA-256: e52ec48e5553cae5546a83d4262af412abf1f6d18e6dd8f53aefc3fb2bf8e8f7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious URL identified is ttraff.cc, which is known to host redirectors. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to drive traffic to malicious sites. 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.cc/pify?keyword=african+american+music+an+introduction+second+edition+pdf
    • http://wafufi.discoveringtheremarkable.com/uploads/1/3/1/4/131438392/d9be1fa39e.pdf
    • http://files.okbetabeta.org/uploads/1/3/1/8/131856173/882320.pdf
    • http://files.openorchardproductions.com/uploads/1/3/1/1/131164475/vilatejexolawipaw.pdf
    • http://files.12amphotography.com/uploads/1/3/0/8/130814209/lifimovajixoza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rabilividobakomitunaxizug.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/zogosimokodonevepamudu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5353/files/wavafinogilixerezaxik.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/34055612883.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1095/files/61238099579.pdf
    • https://cdn.shopify.com/s/files/1/0432/6080/5280/files/tolavimitakafawutisupafed.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/kozuvufizagurax.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/tawejizivesomodix.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/metagifojamawasalavuta.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/xazoreme.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4847/files/fundamental_attribution_error_theory.pdf
    • https://cdn.shopify.com/s/files/1/0435/4224/9631/files/gabiruxogunalopolumowut.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_off0000661f.bin
61d1a5d4449f6f6bdee262e74715da9bebebdc1d864e1ac037d81ed105acd4e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x661F 5260 bytes
font_01_sfnt_off000077ec.bin
a6810284536efb6595178401dd7054ab29e4a50bbd5c0b8ed6f5dd9c99b54ae3
pdf-font-stream PDF embedded font (sfnt) at offset 0x77EC 10132 bytes