Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40f8a85d91f91f9…

MALICIOUS

PDF

39.3 KB Created: 2020-07-27 18:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc1f0c42880d2a8ba69e413685a48860 SHA-1: 6264effc464bf0646b4f7de98d4116184779936b SHA-256: d40f8a85d91f91f92489b69695c9ce46cfc8746df6625c014874a07485c6db6f
152 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 linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=apc+back+ups+xs+1500+manual`. Additionally, it exhibits a PDF link farm pattern, with numerous links pointing to Shopify domains, one of which is `https://cdn.shopify.com/s/files/1/0432/0333/0208/files/377945656.pdf`. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'Apc back ups xs 1500 manual', suggesting a lure for users seeking this information.

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=apc+back+ups+xs+1500+manual
    • http://files.shinebeer.com/uploads/1/3/2/6/132681450/rinalojag-gepaganid.pdf
    • http://files.christianbaptist.ca/uploads/1/3/0/9/130970008/tulovinebu_jowupasi_xofakapuxede.pdf
    • http://files.resumephenom.com/uploads/1/3/0/7/130738956/4d39a3c66ce5.pdf
    • http://files.pineapplecoffeeandtea.com/uploads/1/3/0/7/130739744/2750509.pdf
    • http://files.resumephenom.com/u
    • https://cdn.shopify.com/s/files/1/0432/0333/0208/files/377945656.pdf
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/23933212067.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/81162998953.pdf
    • https://cdn.shopify.com/s/files/1/0437/3836/6104/files/rijadezuvun.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/bagibipegadimodebep.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1200/files/zaxofew.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/suvojadetimopufozisukab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0432/9734/1604/files/10964299873.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/74764523998.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/dajikagatobumokava.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/vojogesuwosifanixire.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2753/files/xisajelujugiwevuvugefel.pdf
    • https://cdn.shopify.com/s/files/1/0430/8513/6021/files/51771954185.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_off00005cd3.bin
ec52db1c3941eb1643f78ae48811c58bc6d3326488f2d8069f42c63b72f30f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD3 5088 bytes
font_01_sfnt_off00006e04.bin
cc8d4505b6799b13d92dec9f2d66dbadc58a82c4211f7933662bbe24dbcda0eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E04 9996 bytes

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