Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef3be1e4aeba5ce…

MALICIOUS

PDF

94.2 KB Created: 2020-08-08 06:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e29ef6333d4c39c98aba512ff5f17d83 SHA-1: 2c7393040d89567d9a93359db3037337f21a8b8d SHA-256: 0ef3be1e4aeba5cee2b2a77107f54baa861ea1463e918f1d05e422147d677034
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, likely to obscure the malicious intent. 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=jenis+plasmodium+malaria+pdf
    • http://files.fruitsandrootswinetours.com/uploads/1/3/1/6/131606056/zaloxe-befopetemoxeta.pdf
    • http://gomevolol.amyshomedaycare.com/uploads/1/3/1/4/131409090/979685.pdf
    • http://digatoju.thebraider.com/uploads/1/3/1/4/131437987/6111243.pdf
    • http://files.jessicakimsociology.com/uploads/1/3/1/3/131398000/wekirosuvakoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/analog_and_digital_signal_processing.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/7706591487.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/jegunojezoxepobate.pdf
    • https://cdn.shopify.com/s/files/1/0430/7740/2778/files/75780218827.pdf
    • https://cdn.shopify.com/s/files/1/0434/7196/2265/files/basella_alba_medicinal_uses.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/tuwexajoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/rains_of_castamere_instrumental.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/kiralite.pdf
    • https://cdn.shopify.com/s/files/1/0438/3057/5266/files/how_to_annoy_your_friends.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/narikited.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/blister_in_the_sun_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/passion_planner_academic.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dbc.bin
c4d3ff4b4d498be4a38bde48553579956b43fb1ec0616d0cf78d7a637fd83bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 4980 bytes
font_01_sfnt_off00012e7b.bin
d18000836f49984c97a57542b70f02627507a45c8759f0430ff1709d83cf1b54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 14820 bytes
font_02_sfnt_off00015cce.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCE 4324 bytes

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