Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3978f41b1e54857…

MALICIOUS

PDF

33.6 KB Created: 2020-08-18 15:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb40bd94b4851a691065c769ce2d0701 SHA-1: 48c6dd8c6c34c4d1af0e2297588cab5bdb78aee3 SHA-256: a3978f41b1e548572e10b75cbb67ba5e14af7e94ea365090a33129dedaee6109
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as sheet music, which leads to a link farm of other PDFs. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the ttraff.com redirector URL, which likely serves as a gateway to further malicious content.

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=circle+of+life+elton+john+sheet+music
    • http://files.lillysquiltsandgifts.com/uploads/1/3/1/4/131438260/9426045.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9379/files/performance_appraisal_feedback_to_manager.pdf
    • https://cdn.shopify.com/s/files/1/0431/3209/2573/files/automotive_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/26012511231.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/vokapodepapofax.pdf
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/24175038598.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/kulekake.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/bull_horn_sound_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/41437922985.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70934180934.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/73116333992.pdf
    • https://cdn.shopify.com/s/files/1/0452/2721/2957/files/kandungan_daun_binahong.pdf
    • https://cdn.shopify.com/s/files/1/0437/0835/0615/files/wezikemurusapegaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6426/1797/files/ziworuvewo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6619/5106/files/65404290350.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_off00004868.bin
2bbc0d7d20486f9be3c0452147ae2eedf4964aeae8e40c05ed388d1922875988
pdf-font-stream PDF embedded font (sfnt) at offset 0x4868 4892 bytes
font_01_sfnt_off000058d8.bin
b77f2c83338c200a82dbe3c5868ad7f1a9e7e86779381eb7a16754fa3446d43b
pdf-font-stream PDF embedded font (sfnt) at offset 0x58D8 9612 bytes