Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cacadb9618bb72…

MALICIOUS

PDF

51.0 KB Created: 2020-08-02 18:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5ed536b8dab0bf441fa48cc2500622c SHA-1: fe82e028632d85a9cad2154f3ba4481059706205 SHA-256: 27cacadb9618bb7280bb4748dd941728ce024a3bb54ef6b35c51d725eac5a3d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be a phishing lure using a seemingly innocuous link.

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=john+lennon+beautiful+boy+lyric
    • http://files.namourstudio.com/uploads/1/3/2/6/132682471/8044329.pdf
    • http://files.jerseycarpets.com/uploads/1/3/0/8/130814216/2983082.pdf
    • http://files.affirmativeresearch.org/uploads/1/3/1/8/131872054/mozotazoganuwed.pdf
    • http://files.gracelaneboutique.com/uploads/1/3/1/4/131452988/sogulinujotam_xukufukunolimo.pdf
    • http://files.jerseycarpets.com/uploads/
    • https://cdn.shopify.com/s/files/1/0434/8215/3112/files/kalivowiwesoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4650/files/gumuxuzagujoxe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/99626423360.pdf
    • https://cdn.shopify.com/s/files/1/0438/8729/6680/files/98937219571.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1847/files/gisisusesusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/23869897890.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5135/files/kamowalonalisedasif.pdf
    • https://cdn.shopify.com/s/files/1/0436/5657/7182/files/nujasopa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/33772222874.pdf
    • https://cdn.shopify.com/s/files/1/0438/4954/7938/files/kisasovugomusavor.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/bofurote.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_off00008a1a.bin
e915a46b3bb168e00e7e9d5e809aa9279c2c3aff0f793892f42fb329b9a0fe1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A1A 5024 bytes
font_01_sfnt_off00009b3a.bin
5783ce6b11e4b8fd96a822ad0964df80afae35bb135376e1ed8880fd7c922fe0
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3A 10472 bytes