Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1363d399541696…

MALICIOUS

PDF

44.0 KB Created: 2020-08-04 03:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55d3e1ee292577930061b4d5975a6202 SHA-1: 0be2b13e21955795391e18207b0ae11a4f746437 SHA-256: 0b1363d399541696223d49852623b2bbbe6392aff274267ac9c00417d84a997c
154 Risk Score

Malware Insights

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

The PDF contains a lure for free recipes, but the embedded link directs to a known malicious redirector. The document also hosts a large number of external PDF links, characteristic of link farm spam. While no scripts were explicitly extracted, the PDF structure and malicious link indicate an attempt to redirect the user to potentially harmful 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.ru/pify?keyword=free+air+fryer+recipes+pdf
    • http://files.motherworkscville.com/uploads/1/3/2/7/132741109/ririb_gokomado_rutudapejejifu.pdf
    • http://files.chippewakeryx.org/uploads/1/3/0/8/130874300/1710678.pdf
    • http://files.morroandjasp.com/uploads/1/3/0/9/130969375/wojerodijudo.pdf
    • http://files.historyleadership.com/uploads/1/3/2/6/132681740/fekaxojuto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4726/3128/files/75741095390.pdf
    • https://cdn.shopify.com/s/files/1/0429/1103/9655/files/78842618803.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/9853085564.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/59498494528.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/purimajejepixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/33949433274.pdf
    • https://cdn.shopify.com/s/files/1/0446/1314/0643/files/apache_tomcat_tutorial_linux.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/93516934053.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/59370947026.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/67233903709.pdf
    • https://cdn.shopify.com/s/files/1/0429/5078/7231/files/17686854700.pdf
    • https://cdn.shopify.com/s/files/1/0432/8272/7067/files/49217670258.pdf
    • https://cdn.shopify.com/s/files/1/0428/7214/4038/files/55220051128.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_off00006ed7.bin
4b29918ffc8cf2c4904f2c5b883bc36ac19dd50c6a3a4f24b532775e91adf58b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED7 5176 bytes
font_01_sfnt_off0000808f.bin
26e09ecff314e6f0539f73527224a4a24671ba98fb72613646b04de043507fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x808F 10000 bytes

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