Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed9431cb2714b47…

MALICIOUS

PDF

44.9 KB Created: 2020-08-09 02:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9003ac4d0a59758f2413f10050fa762 SHA-1: 48dd70fdc923a7821dc38a3375454092b951f8d4 SHA-256: 2ed9431cb2714b470c31cd0345f05a992f83e9026feb3d5d104f5b86958dce1f
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'free download' and the malicious URL itself, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a harmful destination.

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.com/pify?keyword=amish+tripathi+ravana+pdf+free+download
    • http://files.tacomaseacadets.org/uploads/1/3/2/6/132682564/4929253.pdf
    • http://files.ccbkindergarten.com/uploads/1/3/0/9/130969052/8b928514.pdf
    • http://files.mariannemcshane.com/uploads/1/3/1/3/131383998/sedage.pdf
    • https://cdn.shopify.com/s/files/1/0454/7385/7686/files/98034835157.pdf
    • https://cdn.shopify.com/s/files/1/0439/2127/7096/files/msc_zoology_practical_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/45943416628.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/todexarim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/65638785695.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5025/files/ccmb_phd_entrance_exam_question_papers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ziduvawijixivobufanevi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7916/2263/files/bsnl_recharge_plans_up_east.pdf
    • https://cdn.shopify.com/s/files/1/0434/7926/9541/files/bikoxevotagupibuw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005509.bin
380a3f1f06e0adfe58d717c5404c8d1a401bf93cb5f324a3fe3a31fffcb50544
pdf-font-stream PDF embedded font (sfnt) at offset 0x5509 5420 bytes
font_01_sfnt_off00006761.bin
d28fdf297683d896ea3de53a12c2fafc568c3e541f4fd5c3910184792ae5ae04
pdf-font-stream PDF embedded font (sfnt) at offset 0x6761 12248 bytes
font_02_sfnt_off00008efd.bin
f1831cb980b4a40ac87551c4c5bf852853df26a12ba1b2cb4d623081011e36c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFD 6804 bytes