Malicious PDF — malware analysis report

Static analysis result for SHA-256 725573299cb66a31…

MALICIOUS

PDF

42.0 KB Created: 2020-07-31 21:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e16e3a8454946ff56bad205ac3527e2e SHA-1: e781681f31d3c81663f0a9ff6245ef900a01b6a9 SHA-256: 725573299cb66a314a1717ede46c2a34c097cbd0e19504c1a88df53082ff2a0f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a primary link identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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.ru/pify?keyword=total+gym+2000
    • http://files.stephenmwalsh.com/uploads/1/3/0/7/130775231/simepukap-gikolumezofatu.pdf
    • http://files.susannej.com/uploads/1/3/0/7/130739239/7845282.pdf
    • http://files.kayakanglersofmissouri.com/uploads/1/3/0/8/130814718/1557884.pdf
    • http://files.lynnmiriamceramics.com/uploads/1/3/0/8/130813988/3330.pdf
    • http://files.spilt-salt.com/uploads/1/3/0/7/130775828/916198.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4891/0498/files/6811557264.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/33433180151.pdf
    • https://cdn.shopify.com/s/files/1/0435/1344/6564/files/dobuwavazarexe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejupabofutub.pdf
    • https://cdn.shopify.com/s/files/1/0438/3807/9138/files/56743198047.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9423/files/60889051986.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5580/files/77642850616.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/57479943522.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/20979100523.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/12884192767.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/jukaxugatujinikofufav.pdf
    • https://cdn.shopify.com/s/files/1/0428/8774/1607/files/xufesewarizonige.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006730.bin
2faba32cee8d2b2218c484fc3047b2d53351b44ef40c88c0eead493a5c9cf079
pdf-font-stream PDF embedded font (sfnt) at offset 0x6730 5056 bytes
font_01_sfnt_off00007860.bin
b2fef79782da58abbafaed67668aa351be5d9f7906c01b2ac5341f8b353bf2a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7860 10296 bytes