Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf08d5fc2d024f6…

MALICIOUS

PDF

35.9 KB Created: 2020-08-15 04:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 215497742e05aacd11604b76f8af5341 SHA-1: 586a702ad8a244cc0b6f8ef86a5474c0dc4b4d48 SHA-256: fdf08d5fc2d024f69abea8d05297638290a498bd8b8618cc838b3c8b4c0f7bbb
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com', which is further contextualized by the document body mentioning 'N64 emulator free apk'. This suggests the document's primary purpose is to lure users into clicking malicious links that likely lead to malware downloads or further phishing attempts. No scripts were extracted, but the extensive link farm and the specific redirector URL are strong indicators of malicious intent.

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=n64+emulator+free++apk
    • http://files.abingtonconcrete.com/uploads/1/3/0/9/130969494/5e693bda3e.pdf
    • http://zowated.pampanga-properties.com/uploads/1/3/1/0/131070711/dajobilajo.pdf
    • http://files.aquazooextremepets.com/uploads/1/3/0/7/130739991/zoxukamokesanaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1298/files/relodu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/sleep_hygiene_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0428/2266/4348/files/kadulinenaneragitexapas.pdf
    • https://cdn.shopify.com/s/files/1/0430/9113/2567/files/46605420549.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/alphabet_worksheets_for_pre_k.pdf
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/27957340476.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/makosarog.pdf
    • https://cdn.shopify.com/s/files/1/0440/6745/5128/files/femaneg.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/makil.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/tezavoxagonis.pdf
    • https://cdn.shopify.com/s/files/1/0437/7103/5809/files/62575494656.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_off00004ec5.bin
461cf65f4d17787c2467125e81efe9f9692a244d3ef8d1c59dd62a5dee44832e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EC5 5144 bytes
font_01_sfnt_off0000603b.bin
aa852825f5785e58ee92207208ff06b35aae3121b873c9114a5a38a13e5e5842
pdf-font-stream PDF embedded font (sfnt) at offset 0x603B 10188 bytes