Malicious PDF — malware analysis report

Static analysis result for SHA-256 5997be8cd2d9fbd0…

MALICIOUS

PDF

45.0 KB Created: 2020-08-01 15:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c11c3cdff1f18afe761a24bed69a91f SHA-1: 16aaf8296775817b54b01a329855bbfe62827b8e SHA-256: 5997be8cd2d9fbd055f5238b8714b48ce23c9223d854e80d09c978e4f47f5cf2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains with numeric slugs, indicative of a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=lexus+is300+manual+swap'. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text but also includes the malicious redirector URL and several Shopify URLs.

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=lexus+is300+manual+swap
    • http://files.tcpmagic.com/uploads/1/3/0/7/130776779/5723175.pdf
    • http://files.semperfryllc.com/uploads/1/3/0/7/130739831/juredowofafu.pdf
    • http://files.koncreteflava.net/uploads/1/3/0/7/130775623/rolofusam_depelakoripeton.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/48308191438.pdf
    • https://cdn.shopify.com/s/files/1/0439/2694/5947/files/chemistry_4th_edition_gilbert.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3397/files/direjimekiramugupe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5435/6897/files/8882751744.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/zapiwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72274594547.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67279733654.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/zawepipawexoneda.pdf
    • https://cdn.shopify.com/s/files/1/0432/2872/5405/files/jurubobofubi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3117/5063/files/lalidukuz.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_off0000705c.bin
a54aced3258d08c535acc6e26d75d98865532dcef3b2dcf8c6fd9f180653f2b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x705C 5276 bytes
font_01_sfnt_off00008254.bin
9a3ed7fb5fab86d1777fb88dae92fc3c4299e96426d9873c526fe3333d9c278d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8254 10448 bytes