Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c35b61bfa46260…

MALICIOUS

PDF

40.0 KB Created: 2020-08-17 10:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd8eda8f436846ebd3d1e98a1733a4a5 SHA-1: bdf0e6306b60955283e88f033ebd984368deb8e2 SHA-256: 91c35b61bfa4626053226062d2eeecce0e21ea48e0d65dd9512bb31332fa2825
152 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 a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=smartsheet+center+for+excellence'. The ML classifier also strongly indicated maliciousness. The document body text, though heavily obfuscated, contains references to the redirector URL and the link farm. This suggests the PDF is designed to drive traffic to malicious sites.

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=smartsheet+center+for+excellence
    • http://dizoval.sarahbovy.com/uploads/1/3/0/8/130874218/04e5b89d30f83b5.pdf
    • http://files.kenvanrees.com/uploads/1/3/1/6/131636807/pewonos-bikemakudelilex-migokeka.pdf
    • http://files.juicecreativ.com/uploads/1/3/2/7/132740700/juremu.pdf
    • http://files.puriri-wiltshire.co.nz/uploads/1/3/1/4/131436991/xenesadodega_lozaxedevo_libisawerab.pdf
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/vutibimadikivuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/riduxagalowifaxotaraloga.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/somonijezebaro.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/ethical_considerations_when_conducting_research.pdf
    • https://cdn.shopify.com/s/files/1/0432/6880/0676/files/divinity_original_sin_2_beginners_guide_ps4.pdf
    • https://cdn.shopify.com/s/files/1/0435/1688/7192/files/fedakopafi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1805/files/31100389834.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/3d_to_step_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/86859431203.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1911/files/29485339784.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tefabojukiva.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/fopitufiruxumowomidok.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_off00005c8a.bin
7cb4ce88732f2ceb2a0f0dd01698b38d2fba4caa3ba2f3978ec96276750cd4e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8A 5292 bytes
font_01_sfnt_off00006e5c.bin
b4569c137ebbc59931e7dea85b3a03b1001af7734b16b1f50d7a8abd5ea53546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5C 10840 bytes

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