Malicious PDF — malware analysis report

Static analysis result for SHA-256 8553b691f770bad6…

MALICIOUS

PDF

39.6 KB Created: 2020-08-25 08:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d01a527791b2b03f8759c9e2765cfd3a SHA-1: 5d7fd2708fdc9cc517bac28ef4ed368a66442e63 SHA-256: 8553b691f770bad6d294e2c8452e794e38ca0a27c0e85503cc21ee6b37cd61ea
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified as a redirector. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness. The presence of embedded links and the redirector URL suggest an attempt to lead the user to a malicious resource, likely for further exploitation or phishing.

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=mind+teasers+with+answers+pictures
    • http://files.rutherglenlamaisonstarnaud.com/uploads/1/3/0/7/130775011/3484955.pdf
    • http://gimagab.chrisczubatyphotography.com/uploads/1/3/1/3/131379246/665119.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0456/8360/5663/files/bose_micro_bluetooth_speaker_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/twist_of_the_wrist_trke.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7402/files/49278552341.pdf
    • https://cdn.shopify.com/s/files/1/0432/3963/7155/files/lusabogaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/budazasinopuxa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/samidano.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/foxikizugerelibasamif.pdf
    • https://cdn.shopify.com/s/files/1/0462/7755/8432/files/22249976780.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/95104803095.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_off00005ccd.bin
578129fe8d04d90b936656400102703754b07edcc1f983a2994d9a005c64d79a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCD 5228 bytes
font_01_sfnt_off00006e9d.bin
cbc6f646a6f792aa6067825fd4685f5a8ca7512f0bfeaac58a4c0be55f0049dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9D 10332 bytes