Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b933c7250e7b3c…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 15:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0889125779e4617b5a0d7888bce15426 SHA-1: c2eb89e1bd89108e5b79252170364232e443c295 SHA-256: d6b933c7250e7b3c830b272cadecb14d11df2f4a1e637347a281deb510b08ef5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'audio books with pdf'. The primary malicious URL identified is https://ttraff.com/pify?keyword=audio+books+with+pdf, which likely serves to redirect the user to a more harmful destination. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning attempt to attract victims.

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=audio+books+with+pdf
    • http://vixomarew.zerohourtimes.com/uploads/1/3/0/7/130775432/dejeju.pdf
    • http://files.m2consultantsinc.com/uploads/1/3/1/6/131606127/9590f140.pdf
    • http://files.stmarysbrollagh.com/uploads/1/3/0/8/130874495/vadidek.pdf
    • http://files.healthierhappiertogether.com/uploads/1/3/1/0/131070375/wuvufejozanovuki.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/bubaron.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/76323203612.pdf
    • https://cdn.shopify.com/s/files/1/0428/2236/9446/files/kiss_kiss_chris_brown.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/4673387198.pdf
    • https://cdn.shopify.com/s/files/1/0429/2637/5071/files/78591360119.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/segisesanebiwil.pdf
    • https://cdn.shopify.com/s/files/1/0431/9998/7873/files/nogelor.pdf
    • https://cdn.shopify.com/s/files/1/0438/5443/0368/files/87893070373.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/6070352579.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/dantdm_five_nights_at_freddy_s.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/renal_dialysis_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0438/8143/1195/files/riwutakujani.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_off0000653f.bin
5dc0f4bb0df044d0a09ecb233fc242982978cbe974ee8903d260b7b94f4d1822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653F 5076 bytes
font_01_sfnt_off0000769a.bin
ae7754d5ee27f607adbf0d72e6fc9c58c4ae145be0357c00c1b9a39cf65ac248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769A 10424 bytes

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