Malicious PDF — malware analysis report

Static analysis result for SHA-256 241e491cd64e9cf5…

MALICIOUS

PDF

48.2 KB Created: 2020-08-13 00:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fa77e03b1a9aa0fcf0a1ad9c5cce3fc SHA-1: e4fc0aee4ddaf5c86f9ff51dd9afc35914ccf557 SHA-256: 241e491cd64e9cf591e182298c2c236cd3d2ed9db4cb8efe41d4a7b17ca08a7d
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 of which point to a link farm designed to host SEO-optimized PDFs. One of these links, https://ttraff.ru/pify?keyword=amplitude+modulation+tutorialspoint+pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains the malicious URL.

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.ru/pify?keyword=amplitude+modulation+tutorialspoint+pdf
    • http://files.headfordgirlsns.com/uploads/1/3/1/4/131437566/rorokusasidex.pdf
    • http://vokanox.talltechteacher.com/uploads/1/3/2/3/132303382/vojobofok-juxobegoromut-gazol-gevepakilaloro.pdf
    • http://files.aulac-restaurant.com.au/uploads/1/3/1/3/131379194/ginuw.pdf
    • http://files.investwithsmdc.com/uploads/1/3/2/3/132303373/ae097.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6138/files/58531839598.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/coordinate_system_and_map_projection.pdf
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/london_on_da_track_drum_kit.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7294/files/41163586647.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6335/files/73272376863.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/42181050801.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3157/files/83345509465.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3820/files/bohr_atomic_model_postulates.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0023/files/draconic_energy_relay.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/19211692369.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7872/files/genapujoxuzelemudid.pdf
    • https://cdn.shopify.com/s/files/1/0431/0050/4217/files/retirement_party_flyer.pdf
    • https://cdn.shopify.com/s/files/1/0429/7162/7673/files/sivasijojerul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067f3.bin
2e1d62679d17c072078b8e2863ba7c58580ea162cb32859aa483079816286361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F3 5056 bytes
font_01_sfnt_off000078fe.bin
daae9b527203dfc5370ef7e220d3d92228192ebc54949dfdc68eac2201df0b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FE 14076 bytes
font_02_sfnt_off0000a5c5.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5C5 4324 bytes

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