Malicious PDF — malware analysis report

Static analysis result for SHA-256 d595acc2246d9c0c…

MALICIOUS

PDF

42.7 KB Created: 2020-08-23 15:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ced73a0fcd9906c1eb45dc088700c4b8 SHA-1: efc56da1cff34463779941744ce30e531b523c92 SHA-256: d595acc2246d9c0c630b2d88cbdb54972546526491f6084068902b527bcc13ed
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=breezin+thru+theory+answer+key+chapter+5'. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key', a common lure for phishing or malware delivery. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm designed to obscure the ultimate destination.

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=breezin+thru+theory+answer+key+chapter+5
    • http://gojorow.ncaeec.org/uploads/1/3/2/7/132712324/nafofel.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/37677083192.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/bingo_video_maker_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/43315667845.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/zujiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/tagiverusofim.pdf
    • https://cdn.shopify.com/s/files/1/0435/8144/0168/files/33501925626.pdf
    • https://cdn.shopify.com/s/files/1/0437/5199/7592/files/17909092818.pdf
    • https://cdn.shopify.com/s/files/1/0431/8887/9521/files/dreamweaver_cs6_tutorial_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/neoplasia_endocrina_multiple_1_y_2.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_off00006779.bin
1ef6423f71524c8a3147999bb8cad978a647c69a4fe670e3437eb649b583780d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6779 5468 bytes
font_01_sfnt_off00007a39.bin
f80f6d344c04f787b8cd009a8193ac60f237288c3152fcf54fe73e830bdd4acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A39 10592 bytes

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