Malicious PDF — malware analysis report

Static analysis result for SHA-256 934e01dbeb40af35…

MALICIOUS

PDF

32.5 KB Created: 2020-09-03 17:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09733606d24c6ae5c8d5d45cb71c44c3 SHA-1: d9fd7b2346f0ac9c6cf602a2e703c4a06cbdd405 SHA-256: 934e01dbeb40af357934d681c559462b28b207d06cfed2823ab8f0b9ea3528ef
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm used to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector, ttraff.me, which is likely the ultimate payload delivery mechanism. 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.me/pify?keyword=basari+song+ringtone
    • https://cdn.shopify.com/s/files/1/0435/9186/0383/files/fuserekimofedemirabimed.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/96754793479.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1237/files/apk_videoder_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8263/files/ceo_appointment_letter.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2485/files/22537037360.pdf
    • https://cdn.shopify.com/s/files/1/0464/2507/9960/files/25951667143.pdf
    • https://cdn.shopify.com/s/files/1/0436/4949/9289/files/35100615446.pdf
    • https://cdn.shopify.com/s/files/1/0432/7777/9100/files/rimafixepiduworosuxilen.pdf
    • https://static.usrfiles.com/ugd/b926a8_543b108654834832ade873050ed0582b.pdf
    • https://static.usrfiles.com/ugd/0adedf_2fb8a1402e7b4f1a82af726acbc947f1.pdf
    • https://static.usrfiles.com/ugd/289c5e_5d78db11ef264213b386cbd5a78e0466.pdf
    • https://static.usrfiles.com/ugd/963627_14a047bd68234b198df7f28f98ec0683.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_off00004511.bin
57d0fb851552d6edebfe19f18768bbdde08a1347da42ab07d446e867e65ea9af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4511 4872 bytes
font_01_sfnt_off000055b2.bin
728621a16183792d9c41fecb99eb70e7b054040251420c1c281154103f55e233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55B2 9460 bytes

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