Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4db8ce2ae0d4548…

MALICIOUS

PDF

45.8 KB Created: 2020-08-29 00:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7fc9db2843c57c9386f866864e5e776 SHA-1: 650ca52c59de2480220d69698a54d72bf591e8fc SHA-256: c4db8ce2ae0d4548a1d62870822c61e3a132e1c3207a63d224a6a05eae9ce106
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though partially corrupted, includes a URL that appears to be a lure for a specific search term ('lotro minstrel essence guide'). The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to drive traffic 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.cc/wix?keyword=lotro+minstrel+essence+guide
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/cartello_vendesi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/93307633637.pdf
    • https://cdn.shopify.com/s/files/1/0433/7867/1783/files/best_practice_guidelines_treatment_ptsd.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zizamazigunonafimav.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/21639611448.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8777/files/5447763040.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/gunopewuwokakel.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/saneroxozip.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/xipusovip.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1158/files/brock_biology_of_microorganisms_test_bank.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/25893023117.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/pigomofago.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/topix_cape_girardeau_mo_forum.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/battlegrounds_free_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0814/files/26720740624.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_off000076b0.bin
4d913c30d9e9bae8cc6af1626d95b6868cece4008b13f69787c70ee48562febd
pdf-font-stream PDF embedded font (sfnt) at offset 0x76B0 4988 bytes
font_01_sfnt_off0000878d.bin
d31fef0d76ee57b4da3bf71ea3cce462fe281d9782c29afb7e4c52c47b567333
pdf-font-stream PDF embedded font (sfnt) at offset 0x878D 10240 bytes