Malicious PDF — malware analysis report

Static analysis result for SHA-256 5184579f06f4cf15…

MALICIOUS

PDF

38.4 KB Created: 2020-08-25 07:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13aa847a3abe0b1b0708b5f80206b36a SHA-1: 9079667e4c95f732f7298f67bc14e523ace9df93 SHA-256: 5184579f06f4cf151b5c21c7686176e138f4a0e99db361b707451e91ca86031b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, creating a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious destination. The document body, though heavily obfuscated, contains the same URLs, reinforcing the link farm and redirection attack pattern. No scripts were extracted from this sample.

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/pify?keyword=fur+alina+piano+sheet+music
    • http://files.nlgsacramento.com/uploads/1/3/2/6/132683357/3557768.pdf
    • http://kasexawij.subterfuge-au.com/uploads/1/3/1/1/131163635/8feda27cfacd7.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/craigslist_org_chattanooga.pdf
    • https://cdn.shopify.com/s/files/1/0464/8042/5112/files/teseduxabep.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0247/files/87917003462.pdf
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/14692498861.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/59755660528.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8775/files/zetipa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/livofefuvagetabeked.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/70930279953.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/georgia_armenia_azerbaijan_lonely_planet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/dagize.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_off00005a40.bin
9cae1d16fac9251ce5b4ea2968704e801cf67cb29e782d2f9048109f987e384a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A40 5128 bytes
font_01_sfnt_off00006b80.bin
5034598cea82773d83be9d3d1a2dd91e7399e125b0e3534e904080fa7028cc1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B80 9876 bytes