Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0e2a2e3d958fa4…

MALICIOUS

PDF

44.9 KB Created: 2020-08-09 15:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39878c1a3145c97c47dd75f5721a7f64 SHA-1: 61a109514a9710bf25dc23d81e4b1ba799b6252f SHA-256: db0e2a2e3d958fa488556b08fe79bf11c7cce042a25e98bcf91894bcdcf4e72b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at `ttraff.ru`. This suggests a link farm or SEO poisoning technique used to distribute malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect the user. No scripts were extracted from this sample.

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=non+ruminant+animal+production+pdf
    • http://files.hanstsportnutrition.com/uploads/1/3/1/3/131384025/f2c066.pdf
    • http://files.opi-medical.com/uploads/1/3/1/3/131384401/rivobu-gumakadefemu-piramokanesewa.pdf
    • http://files.ebonridge.com/uploads/1/3/1/0/131070762/tadutediwivuwiviwid.pdf
    • https://cdn.shopify.com/s/files/1/0447/5109/3914/files/logback_xml_examples.pdf
    • https://cdn.shopify.com/s/files/1/0434/9024/6822/files/diamond_generator_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/29014870109.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/tutitojulavesepuxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/66696719297.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/popej.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/55806697225.pdf
    • https://cdn.shopify.com/s/files/1/0437/6995/4453/files/wosetametelijapimoxejupur.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/30806378442.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/semidadosusadedebapeba.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/wosozitimusawud.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5805/files/43890682180.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/maguvisasuputupakakuvijak.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_off00007193.bin
7d5f2fbbd266a2fffde5be67ef1dedc87ab66bbc03c856fdaef6c3ddaed3f8ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x7193 5092 bytes
font_01_sfnt_off000082d2.bin
397e8911328b9a248f33930b09cd0ffa4750868ec1e78f1662e305c5303ed804
pdf-font-stream PDF embedded font (sfnt) at offset 0x82D2 10496 bytes