Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a4a9358689cae2…

MALICIOUS

PDF

46.5 KB Created: 2020-08-07 17:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 383bc70e618fba988a6155611af65e2a SHA-1: c1836b0c739fa63620df83c619305a0ab08cb2a1 SHA-256: c0a4a9358689cae23dbdd753b196cb64dcfe48292e2e86a1f07d11e21f0b9191
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/pify?keyword=fiction+100+an+anthology+of+short+stories+pdf', which is a known malicious redirector. The presence of numerous links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious 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.cc/pify?keyword=fiction+100+an+anthology+of+short+stories+pdf
    • http://files.jjheritage.com/uploads/1/3/2/6/132680781/zuratubiwuraxorabik.pdf
    • http://files.oxbowriversnorkeling.com/uploads/1/3/1/0/131070539/13ed136e0.pdf
    • http://files.ssafetytraining.com/uploads/1/3/0/7/130776589/5871818.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/lumogixapab.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/55837171971.pdf
    • https://cdn.shopify.com/s/files/1/0434/8048/1954/files/reveille_trumpet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/37558423889.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/axial_flow_turbine_velocity_triangle.pdf
    • https://cdn.shopify.com/s/files/1/0438/0806/3649/files/tofaritovuxusilotinoxip.pdf
    • https://cdn.shopify.com/s/files/1/0437/8384/8093/files/apache_storm_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0430/2484/2906/files/3828540622.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/mezevagopidanarabowiraso.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/49558542293.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/23667959972.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2475/files/lomuwiza.pdf
    • https://cdn.shopify.com/s/files/1/0435/2419/4468/files/11537914940.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000696f.bin
0fac8c842e7d8fda3f0a68b071dcfb995f0cc1d5e81fc93ada21ffb8ee24fd44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696F 5456 bytes
font_01_sfnt_off00007bf4.bin
6464b2f6c61ab0b56592cf5499014df0cb7842ca86796d98d8004489ccabb7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF4 10304 bytes
font_02_sfnt_off00009ee7.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE7 4324 bytes

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