Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbb4d19892936fd…

MALICIOUS

PDF

35.0 KB Created: 2020-08-21 01:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d07e4ed819c09138aba4ee4dcd263aaa SHA-1: 090843a51a3f23c69509b2fe5a3d179ef250f73a SHA-256: abbb4d19892936fd1d6f0019a8994768736b08f72676d34a04d95e9a7549acd7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=can%2527+t+calibrate+compass+android'. The document body, though heavily obfuscated, also contains this URL and other links that appear to be part of a link farm designed to attract traffic.

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=can%2527+t+calibrate+compass+android
    • http://vefenu.milliesjumps.com/uploads/1/3/1/3/131383483/febidoz.pdf
    • http://bilafa.brewednblended.com/uploads/1/3/0/7/130775370/99577d5936dd916.pdf
    • http://files.lesleymcshea.com/uploads/1/3/0/7/130776776/9334407.pdf
    • https://cdn.shopify.com/s/files/1/0431/6453/2900/files/moldes_de_letras_grandes_y_bonitas_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/topographic_map_interpretation.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2612/files/l_agriculture_en_algerie.pdf
    • https://cdn.shopify.com/s/files/1/0433/1801/8216/files/rewivijus.pdf
    • https://cdn.shopify.com/s/files/1/0436/1555/1645/files/mufalupewukuvuzububoja.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/1073204073.pdf
    • https://cdn.shopify.com/s/files/1/0433/2496/5019/files/mcquarrie_statistical_mechanics_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/komaletarabuxikuwilejonuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/0900/0103/files/crucial_ssd_clone.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9462/files/wilozufebojipigawizewif.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_off00004d9c.bin
f05bf94bf7704f6c68c161b6c7deee6c6e944bf61a13a58bb302456f72ae25c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9C 5296 bytes
font_01_sfnt_off00005f81.bin
b4383d1543a827a834f01c410a11c594fa44d5cabc49bb386b7a4073b4786ae6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F81 9276 bytes