Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d16cf84e500485…

MALICIOUS

PDF

47.8 KB Created: 2020-09-01 01:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc654fbb58922edc3f64d8a56eaef3ad SHA-1: d3d0c9c91d3a9cb828efd74893b2ee1c9c5ef4e3 SHA-256: 18d16cf84e5004855532f579f91f21670f56af58498aa55cb382a1a7bf4aeb74
154 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which, 'https://ttraff.com/wix?keyword=arrear+salary+format', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to salary formats and the malicious URL, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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=arrear+salary+format
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_aed81ba7b08a47d29e8023889db43d12.pdf
    • https://static.usrfiles.com/ugd/5b604d_e4ac86d268524d9fa7e7168b176e0a29.pdf
    • https://static.usrfiles.com/ugd/c3f59f_4fadfba615874d33bc1aa437ae20e4cc.pdf
    • https://static.usrfiles.com/ugd/451461_c76293e40f03437b9e938af137bce5b8.pdf
    • https://static.usrfiles.com/ugd/67e251_7b568e77c66f4edebf9416d8f86f8dde.pdf
    • https://cdn.shopify.com/s/files/1/0469/0522/9474/files/fovabetedabatip.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5688/files/52821846477.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/susatu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0740/8290/files/forms_of_vitamin_k.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/carbono_asimetrico.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/25829228561.pdf
    • https://cdn.shopify.com/s/files/1/0430/9486/8122/files/zopebusovaka.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/8906714092.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/cinderella_man_question_sheet_answers.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_off00006c5a.bin
0dda897148030a43cda8cdb270658fd94a61441d6799a74efd44473e2f5c909f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5A 4636 bytes
font_01_sfnt_off00007c23.bin
233ab5fff5f599b3fcc3e59248582fa70d223d6c3abe82878211c58ed9942044
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C23 12496 bytes
font_02_sfnt_off0000a45d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xA45D 4324 bytes