Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25aff041d6233e4…

MALICIOUS

PDF

45.6 KB Created: 2020-08-03 10:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f25dd12af168a30130afa2f6778f82e5 SHA-1: b69059258804d991dc264c045f81a0a2639d5372 SHA-256: e25aff041d6233e4b197b04c1c82ff9c0bc110b65c2eda0eca192ba047446ed7
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com), and another detected a large PDF link farm hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains references to these URLs, suggesting the primary intent is to lure users to external, potentially harmful, 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.com/pify?keyword=foo+fighters+everlong+tab
    • http://files.emanuelacooper.net/uploads/1/3/1/8/131856333/dokajexuxeveris.pdf
    • http://files.kcmcommunications.net/uploads/1/3/0/9/130969623/mivikeguvowobuzazuwo.pdf
    • http://files.electramicllc.com/uploads/1/3/0/8/130813738/bitabavimopafogisada.pdf
    • http://files.twinviewstables.com/uploads/1/3/1/6/131606169/nofuvidoxad-nezabasu-jazeroroxopos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1589/files/robeliwuwik.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/zinoxasumomifizijugopipu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/48047786869.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/verofabafi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2502/1603/files/fairy_tail_episode_227.pdf
    • https://cdn.shopify.com/s/files/1/0434/2710/2887/files/2464685225.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/neo_geo_emulator_for_psp.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/bumewumitimevugipa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/53157675033.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1551/files/gozinuxesikipedunufege.pdf
    • https://cdn.shopify.com/s/files/1/0430/9093/5969/files/banuwaveru.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/bazufulexu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/sqrt_x_x.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/xutevirid.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_off00006950.bin
198ea9ec1d5bc7b428b807c6c17149ff765295bbd36bd9f373e68cd923b308ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6950 5184 bytes
font_01_sfnt_off00007b03.bin
92d481f42868ebf1b92f1400ec1a97aae7106d7f784307d2e700b0a905dfd9a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B03 14780 bytes

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