Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f3898f9beb1bf3…

MALICIOUS

PDF

44.1 KB Created: 2020-08-28 12:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f97cebb4477d3585547b10e58fbb638 SHA-1: 3002a969500c8d9c9f25a1f61406d47a6f8c6753 SHA-256: a4f3898f9beb1bf32bef99ef517ce644fc3c79853491d19808a37d32f6db89a3
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external links, with a critical heuristic identifying a redirector link to 'ttraff.com'. This suggests the document's primary purpose is to lure users to malicious websites. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the redirector URL is a strong indicator 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=anker+soundcore+bluetooth+speaker+review
    • http://zujoboni.mercedesclubindia.com/uploads/1/3/2/3/132302780/jixekivu-viridaxefo.pdf
    • http://bifubusok.tpccommunicationsaustin.com/uploads/1/3/0/7/130739892/ropag_peledem_bijaxaroxadowa.pdf
    • https://cdn.shopify.com/s/files/1/0440/9019/6133/files/sapna_choudhary_dj_song_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83260340608.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/damuzawesakulukosot.pdf
    • https://cdn.shopify.com/s/files/1/0430/0541/1481/files/rolerokajopupogapij.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/58939074799.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/40501204334.pdf
    • https://cdn.shopify.com/s/files/1/0435/8966/4926/files/map_projection_parameters.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/jigeratimexajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/kamyab_jawan_form_online_application.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_off00006d10.bin
5ae9411fa8856189f0785e6556da0b12bab4af9a4701046cbd247e88a104bf81
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D10 5508 bytes
font_01_sfnt_off00007fc9.bin
d9b8db5be9272f5f687a84b0e04322e53cb772a7057696fc72f416c54b183a91
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC9 10344 bytes