Malicious PDF — malware analysis report

Static analysis result for SHA-256 657585513d57e3fe…

MALICIOUS

PDF

45.3 KB Created: 2020-07-27 07:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4027d4da77dde0694058e567c25e74c SHA-1: b51a6b6ef15cbd1a962ca4c546c405cdf12b0c22 SHA-256: 657585513d57e3fe036a22a2d718ae052b2b40043db2becf421f6ca55380949d
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This indicates a likely attempt to manipulate search engine results or distribute malicious content through a link farm. The ML classifier also strongly flagged this PDF as malicious.

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=video+er+for+iphone+xr
    • http://files.maison-de-villars.com/uploads/1/3/1/4/131455398/6704720.pdf
    • http://files.wroughtbylight.com/uploads/1/3/0/8/130874361/49c771e9a4.pdf
    • http://files.matchmypartytheme.com/uploads/1/3/0/7/130775651/rujezela_jawabar.pdf
    • http://files.lightsourcechiropractic.com/uploads/1/3/0/8/130813898/8397318.pdf
    • http://files.nphsjrwolfpack.com/uploads/1/3/1/4/131483253/pageponiputi_gosalobire_vopepas_fatibo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3526/3130/files/12332885948.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4602/files/wimezebuvap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78549170372.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/zemifabowalolugedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebisineseboji.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/10979584978.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bekikelazipilexujewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/nerasilojusepowoxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/soduvazififawedoveda.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/82202793434.pdf
    • https://cdn.shopify.com/s/files/1/0431/5892/9570/files/keterativivojuterapopido.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/6360047859.pdf
    • https://cdn.shopify.com/s/files/1/0431/2658/7549/files/toraxunenijurufoxum.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075c8.bin
84bc64491290cd3bef7288d6dd520240813688c45385def52efbdc2be0898f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C8 4448 bytes
font_01_sfnt_off000084cd.bin
3d15f680eeb23a6f1afaa9903e4ab09efaf9b73d9a00210a397df6a0bbb545d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84CD 10284 bytes

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