Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe9fcbd392a382b…

MALICIOUS

PDF

38.7 KB Created: 2020-08-18 19:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c600cfe1952743827438d58c8f40503d SHA-1: ed214ff332dc08487db08dd1accd535fc7b694dd SHA-256: 8fe9fcbd392a382b8c8a68647e98867aaacf18f98e119e083bfa1d2628ade873
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the embedded links, https://ttraff.com/pify?keyword=spanish+future+tense+verbs+worksheets, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to Spanish verbs and the malicious URL, suggesting a lure to a phishing or malware distribution site. 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/pify?keyword=spanish+future+tense+verbs+worksheets
    • http://files.shrineforus.com/uploads/1/3/0/7/130739809/lokenagagewoket.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/nizazep.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6532/files/7857835847.pdf
    • https://cdn.shopify.com/s/files/1/0436/4170/0505/files/hydra_backtrack_5_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/3874/3450/files/ligufuxiwiru.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/kukifodudimelipekiraji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8272/files/91308823484.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/zogizir.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/wonopipitilunusoju.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/2357484384.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_off0000578a.bin
5c2cb292ad8de60da716d709ea541b3e2142f6e7dfde5009812bfc102d073bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x578A 5416 bytes
font_01_sfnt_off000069fd.bin
38547c2ac7fe596bc9d8160d8845f20c95999da5b1258b682dbce48082219a53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FD 10608 bytes

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