Malicious PDF — malware analysis report

Static analysis result for SHA-256 26133baf096f5fab…

MALICIOUS

PDF

34.4 KB Created: 2020-08-11 21:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc8ec230a34fb5001258529c74e45be7 SHA-1: 587f91abab9633fa725989c56e9243f7aaeb6fdd SHA-256: 26133baf096f5fab610d7d26ece19e9fd7875494a64b17beca0336b6cd8ccdc3
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its structure containing a large number of external links, many of which point to a redirector. The document body, though heavily obfuscated, contains a URL that leads to a redirector service. This suggests a link farm or redirection attack designed to lead users to 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.ru/pify?keyword=the+believer+s+authority+study+guide+pdf
    • http://fajenefib.mendelmeyers.com/uploads/1/3/0/7/130776485/wexokejutezekutoso.pdf
    • http://nutige.ilovebuttercups.com/uploads/1/3/2/8/132814930/8752506.pdf
    • http://files.truewealthfg.com/uploads/1/3/2/7/132710687/migejowo.pdf
    • http://files.smrhoa.net/uploads/1/3/1/3/131398176/6173352.pdf
    • http://puvejo.splashoutfitters.com/uploads/1/3/1/6/131607131/zixak.pdf
    • https://cdn.shopify.com/s/files/1/0440/1761/4998/files/jofafobot.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/32409102458.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/zirezawenabajimokapufub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37394074323.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://cdn.shopify.com/s/files/1/0428/1987/9079/files/33497736934.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/sample_business_plan_for_online_store.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/motorcycle_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/bernardo_barranco_el_infierno_electoral.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_off0000485a.bin
61bcf084efacb8239c53b31e65f87671e16068c6decea6f697a11a3f9ffd7022
pdf-font-stream PDF embedded font (sfnt) at offset 0x485A 5556 bytes
font_01_sfnt_off00005b41.bin
dad43164d3fe233b9a1fd29c8abd90b5826b06637e462a9828a7281abf11f707
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B41 9844 bytes