Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ebbf3204d7cd67…

MALICIOUS

PDF

47.2 KB Created: 2020-08-18 13:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d653afaabc058c9bdf96f42a037e0025 SHA-1: b3a34bbab96e9ce72ea72e586d905a6172431ed0 SHA-256: 91ebbf3204d7cd6786355e2269c35018ebb3cd1261aa5b385647e2e00c7be453
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a known malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=ffxiii+2+trophy+guide. The document body is heavily obfuscated and contains numerous other links, many hosted on Shopify, which are likely part of a link farm to obscure the ultimate malicious destination. The ML classifier also strongly indicated maliciousness.

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=ffxiii+2+trophy+guide
    • http://donavagon.ribbonsbiz.com/uploads/1/3/1/0/131070198/8510946.pdf
    • http://files.wisefooltheater.com/uploads/1/3/1/6/131606343/3055998.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/63082746853.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/joxafomazatane.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/credit_suisse_wealth_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0434/6036/2392/files/43432608865.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1986/files/jerowiraseta.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4840/files/vepuzixaresexizobe.pdf
    • https://cdn.shopify.com/s/files/1/0439/1262/6344/files/20912319758.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/59917029843.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/54186225477.pdf
    • https://cdn.shopify.com/s/files/1/0428/7863/2095/files/beginner_dumbbell_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9446/files/28316128061.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/relobowozidujume.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_off00006ec0.bin
cac0b1e5e598b42b3877b0950ca6ffbe532007c89a7b20c6ac38e65b810f098f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC0 4916 bytes
font_01_sfnt_off00007fa5.bin
9fd08b739ee484ce983fb16afdfc6d7dd6af88368739a355d7f2a6c83c3c99d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA5 10276 bytes
font_02_sfnt_off0000a23b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xA23B 4324 bytes