Malicious PDF — malware analysis report

Static analysis result for SHA-256 1918368a02dfde19…

MALICIOUS

PDF

43.9 KB Created: 2020-08-25 00:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 345c3199580e9e8b7bdd6dfb252c9bd2 SHA-1: 9b0c857b2ef53e5ce7832fa6b5021f9921cb6d6f SHA-256: 1918368a02dfde191cec3596335369d968a2bc0f3f5a5fa31ee4b0d749469f9a
152 Risk Score

Malware Insights

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

The PDF contains a link farm, with a primary link to a redirector. The redirector URL is 'https://ttraff.cc/pify?keyword=printable+fractions+worksheets+for+2nd+grade', which is known to lead to malicious infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to lure the user into clicking the link. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=printable+fractions+worksheets+for+2nd+grade
    • http://files.bakingthebakeoff.com/uploads/1/3/1/1/131163931/da0bc.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/vilutavedawezagofufuju.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5340/files/smtp_test_utility.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/36352824097.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/71268729738.pdf
    • https://cdn.shopify.com/s/files/1/0461/8639/7849/files/used_car_buyers_guide_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/46316304311.pdf
    • https://cdn.shopify.com/s/files/1/0430/6481/9874/files/aiff_d_license.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/kelonaxufifozif.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/32097673841.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89832202682.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_off0000669e.bin
4060904813da1a03ef25b5b50ebb583847e2e2583b4649e8661a2783ace02cf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669E 5712 bytes
font_01_sfnt_off00007a13.bin
6fac6069052147e508f583b04c7b4ea33cfa063d75270db82ffcbd0daca7e108		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A13 12096 bytes

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