Malicious PDF — malware analysis report

Static analysis result for SHA-256 3377624ba4d48091…

MALICIOUS

PDF

47.7 KB Created: 2020-08-12 02:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f68842ed8e7475dcd71aba16efdbae29 SHA-1: 1d6e4b1493d78d3b60cbbe39880716fe00a0b9d3 SHA-256: 3377624ba4d480914f009cd11fbbb61f950202ee04e2e56f2be2a3c26f1d1365
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external links, with the first being to 'cdn.shopify.com'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that the redirector is likely attempting to leverage.

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=concerning+the+spiritual+in+art+kandinsky+pdf
    • http://files.allangelslbk.org/uploads/1/3/1/1/131164431/04f950fe2b5ed.pdf
    • http://files.ryleyskelton.com/uploads/1/3/0/8/130873895/2993677.pdf
    • http://files.sarasotaveteranscommission.com/uploads/1/3/1/4/131437493/gogefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/fajuzawomopimixex.pdf
    • https://cdn.shopify.com/s/files/1/0447/9637/9285/files/weight_lifting_for_weight_loss_male.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/vezupowowe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/2749497937.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/sixitokofiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/47510175127.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/lagosu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/20066942713.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/95420081264.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/9066100041.pdf
    • https://cdn.shopify.com/s/files/1/0437/5229/2513/files/62303960287.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_off00007c60.bin
b1f0a37f733c1425f582d10e94ac8ef317ae62dcec3a74b61fbf93810a4d5258
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C60 5488 bytes
font_01_sfnt_off00008f0d.bin
84dfe008745bf54dbe5234d7f75946237aca09bbe3f836a76cfb35634ef6655a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0D 10076 bytes