Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f41fb55c537e3a…

MALICIOUS

PDF

42.4 KB Created: 2020-08-31 18:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f05955b01668ca0ccd35b08a17fde65 SHA-1: 9b6b91421acdf211f514e9741c0549f1d8dde98b SHA-256: 63f41fb55c537e3a05c200796026116cea8c66e428b54fe0e58b85b4d43786a4
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a redirector service, which in turn leads to a URL containing 'walmart+bedding+sheets'. This suggests a phishing or scam lure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users 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.com/wix?keyword=walmart+bedding+sheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_ce024e6719744021a3bd8696711a31d1.pdf
    • https://static.usrfiles.com/ugd/48d9a1_4d1adc385c104d2eafba3b8fc1396e83.pdf
    • https://static.usrfiles.com/ugd/856cea_e24b18a33e8d4a9d9437e32e70c12299.pdf
    • https://static.usrfiles.com/ugd/4cf28d_24da4b89a3d449ffbd0889e98251b810.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a137896d67c4e77980d30d20b4a3800.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/49756573600.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/android_latitude_longitude_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/2274/4741/files/58643698734.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/mipofurewok.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/jarowanenokusenawanopolo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9196/7652/files/average_speed_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0431/9520/3745/files/jupilonajuwuvus.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_off000066fa.bin
14b922ab44cef87251fef46b5e12e1eb90d9713b330b6d72a716923e3fd19cef
pdf-font-stream PDF embedded font (sfnt) at offset 0x66FA 5392 bytes
font_01_sfnt_off00007928.bin
896e979693829ac0d291f69acc48b4e28e66306dbdd49e6c713011c831fb5b5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7928 10556 bytes