Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a755b061a85d28…

MALICIOUS

PDF

41.2 KB Created: 2020-08-18 14:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9409143f91b127f8e6279bd5915bbf6 SHA-1: c308f581afecbeb3c1a71f7b4403f378dcfd3d6b SHA-256: 13a755b061a85d287c088d3e418590773e2809d72483dae802d0dc0a52d8cac5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body itself is heavily obfuscated and appears to be a lure, likely attempting to trick users into clicking these links. The ML classifier strongly indicated maliciousness, supporting the assessment of a link-farming attack.

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=c3+differentiation+worksheet+h
    • http://files.crossroads-engineering.com/uploads/1/3/1/3/131383483/1271992.pdf
    • http://pixazare.msport6.com/uploads/1/3/0/8/130874493/bomerir_tedokotoru.pdf
    • http://files.lucernelyme.co.uk/uploads/1/3/0/8/130814286/kifinogi_kejevowazudadem.pdf
    • http://rojululo.tessagoss.com/uploads/1/3/0/8/130874254/mivemugava.pdf
    • http://zarit.pyroh.org/uploads/1/3/2/6/132682051/nowuxipexox_tiladatirot_sesudepebebura_tojonisilobo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4737/0402/files/customer_journeys_a_systematic_literature_review.pdf
    • https://cdn.shopify.com/s/files/1/0429/8906/0259/files/febetumejokuxenutizis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/rotidenasenijagazawetugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/38644967357.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/the_fall_of_enron_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85947343199.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/alprazolam_medley_bula.pdf
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/paturivomizusozitakak.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/29017287458.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9943/files/bujufimakoxowifatutaru.pdf
    • https://cdn.shopify.com/s/files/1/0428/6975/1967/files/carbon_nanotubes_preparation_and_properties.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/12604337798.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/rotigaxeta.pdf
    • https://cdn.shopify.com/s/files/1/0453/8574/4552/files/18595220773.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_off00005722.bin
b501b23d7b3ab43ebc9ed2d5a6b1da73292bfc678cae37b010a6987032e41987		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5722 5092 bytes
font_01_sfnt_off0000687b.bin
b1b81cd5ba732dfceb8a3a886dcdf4bd5b1bf818ce06d06d7cd407cbad9c5c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687B 9660 bytes
font_02_sfnt_off00008991.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8991 4324 bytes

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