Malicious PDF — malware analysis report

Static analysis result for SHA-256 d006e1824c75363d…

MALICIOUS

PDF

37.5 KB Created: 2020-08-29 21:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1de6b87376d066e9babcc6dbdce6e3bc SHA-1: b78566999726f9e64bd7919c3dd4fe72958949e7 SHA-256: d006e1824c75363d46a566cbe63d489c7b2018a8f7a60f08c3214bed505b1afe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.com/wix?keyword=pictoword+level+79. Another heuristic identifies a PDF link farm, with the first URL being https://cdn.shopify.com/s/files/1/0440/0467/1646/files/little_leaf_of_brinjal.pdf. The ML classifier also strongly flagged this PDF as malicious. The presence of a malicious redirector and a link farm suggests the primary purpose is to lure users 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.com/wix?keyword=pictoword+level+79
    • https://cdn.shopify.com/s/files/1/0440/0467/1646/files/little_leaf_of_brinjal.pdf
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/smart_antenna_book.pdf
    • https://cdn.shopify.com/s/files/1/0454/7844/5206/files/fundamentos_de_biotecnologia_farmaceutica.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/best_acknowledgement_for_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kipisoluni.pdf
    • https://static.usrfiles.com/ugd/0aab01_2e72bff48fac41b7bc4125859e544618.pdf
    • https://static.usrfiles.com/ugd/97634b_0b18ac13ca1e41cda262409b17a6c3e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_39b5926b6d2743f98b7495f268de3080.pdf
    • https://static.usrfiles.com/ugd/b8c837_40d955db258743aca8a77424d677199c.pdf
    • https://static.usrfiles.com/ugd/b8c837_260a36ff4bd146d7914a3785e69143f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9284648f0674d97873414254bab00d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_758a16ec0518498996994908b41602d4.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7234/files/wujajutesepagaxun.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/synchronous_motor_drives.pdf
    • https://cdn.shopify.com/s/files/1/0438/9090/1144/files/balance_of_payment_meaning.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_off0000580b.bin
5faa44efb9b51f7d4119dd4f22113f8718187cff15ba2a2f445ec245ffa9a171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x580B 4936 bytes
font_01_sfnt_off000068ff.bin
e3d34d51059805d769b4a752354482df212fd44d46b0ddf4849913b6219f29d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FF 9652 bytes

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