Malicious PDF — malware analysis report

Static analysis result for SHA-256 154c69e0b9e9353a…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 17:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7cd791f66f769bd98157575a027bde6 SHA-1: 14b60a5caa7ed7b416956c8454132b6d4bad2515 SHA-256: 154c69e0b9e9353a700a50d72001e8b1d4b59d1c82c64499a8683def5c73f521
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO link farming. One of the primary links directs to a known malicious redirector infrastructure. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings strongly suggest an attempt to redirect the user to malicious content, likely as part of a phishing or scam campaign.

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.com/wix?keyword=yay%25C4%25B1n+denizi+aperitif+matematik+tyt
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_06eccc16bcf84d058ab99e4e535c2f86.pdf
    • https://static.usrfiles.com/ugd/6908d7_7c35855155b84b03a66c99696e6de239.pdf
    • https://static.usrfiles.com/ugd/a48928_f47ae274c70b433ebb1d314c05db0501.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3462/files/45818596755.pdf
    • https://cdn.shopify.com/s/files/1/0438/2700/3549/files/38161235888.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/wezogigidufipow.pdf
    • https://static.usrfiles.com/ugd/565485_e240da07e1014270ae323ca3d59f1f30.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca90cdc4ee4248cb9a02fae74eff77a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2614918459544740915951193849d94d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e013ddffe1141b6ae4e7d874a777881.pdf
    • https://cdn.shopify.com/s/files/1/0437/2732/3301/files/wuzosurexemeti.pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9668/files/99628606282.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/ecommerce_website_development_tutorial.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_off00005073.bin
8cf9bb5caa4b8b6a54326f7edabe9c2954e69f43ed04d0ec4286d3ca453ee635
pdf-font-stream PDF embedded font (sfnt) at offset 0x5073 5188 bytes
font_01_sfnt_off00006210.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x6210 1800 bytes
font_02_sfnt_off00006a9d.bin
2ce07fc1c56fc70d39f7564c3e839784a3dd0710e9e300d43e081d6ab3973169
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9D 14096 bytes