Malicious PDF — malware analysis report

Static analysis result for SHA-256 94502ef623b78070…

MALICIOUS

PDF

86.6 KB Created: 2020-08-17 00:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef8affa362a78947aaff3c3ec5853f68 SHA-1: 695750b2c12eaae6f6751bcad0d5c408d3f61200 SHA-256: 94502ef623b78070748b5edd6142169376e9998a5392d42e1f008f297fa55420
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, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or redirection attack designed to funnel users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.ru/pify?keyword=swagger+editor+linux
    • http://vowubax.carsesus.org/uploads/1/3/1/8/131871699/xodaduvujitigiraluz.pdf
    • http://files.counselinginlafayette.com/uploads/1/3/1/8/131856549/zevorewaxaxisuxi.pdf
    • http://kukug.bellcreek.net/uploads/1/3/2/8/132814930/8697597.pdf
    • https://cdn.shopify.com/s/files/1/0430/9418/0001/files/fire_emblem_6_roms.pdf
    • https://cdn.shopify.com/s/files/1/0434/1835/3821/files/mewegugalamexobis.pdf
    • https://cdn.shopify.com/s/files/1/0438/4122/4869/files/bunny_emoji_text.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3898/files/ncert_class_9_science_atoms_and_molecules.pdf
    • https://cdn.shopify.com/s/files/1/0440/8174/1976/files/jazunimex.pdf
    • https://cdn.shopify.com/s/files/1/0435/4090/6135/files/99592217810.pdf
    • https://cdn.shopify.com/s/files/1/0430/3162/5882/files/xotik.pdf
    • https://cdn.shopify.com/s/files/1/0430/2176/2723/files/purity_vst_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/dofilogajevu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/plexiform_neurofibromas_in_nf1.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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000f37e.bin
915644b99a6eb6e3ab79affc4e5344f28971bd8f288ed87ae78eff863ac4d422		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF37E 3936 bytes
font_00_sfnt_off0000c4ae.bin
31d4dd97cf5147e6b059c24d0fa5ef82248f625d272ff84a9e6c0d2f8a785f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AE 6812 bytes
font_01_sfnt_off0000d5b2.bin
685d46efa1d57782e05a9cf2b35d6f2b9b9a834c242cfd252b57bac50cd21635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 3604 bytes
font_02_sfnt_off0000e28f.bin
e2422fc76e1a49198eeaf90d48e152d0063c48a176b60435ba6cc11fc20d3ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 4960 bytes
font_04_sfnt_off00010300.bin
5061410b148476f59d70286dd14c7f2b7fc142cb203bfcf17e40eeb8fb7171cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 10684 bytes
font_05_sfnt_off000127dc.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 16036 bytes
font_06_sfnt_off00013c44.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 4324 bytes

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