Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacf8eaf683892a0…

MALICIOUS

PDF

39.5 KB Created: 2020-09-18 11:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ac0e661f16a16e0acb87742e9d00a3 SHA-1: 68d02f419c8e5d82ec1171a93d0a80856c5eda81 SHA-256: aacf8eaf683892a0731e1bed91346705fae68bd3ade28af53600c0357a37b844
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. The embedded URLs, such as 'https://ttraff.club/wix?keyword=central+high+school+sioux+city+gift+shop' and 'http://gaxomet.littlechiefsprimaryschool.com/uploads/1/3/1/4/131438684/bobegazanitekirolasu.pdf', are likely part of this malicious infrastructure.

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.club/wix?keyword=central+high+school+sioux+city+gift+shop
    • http://gaxomet.littlechiefsprimaryschool.com/uploads/1/3/1/4/131438684/bobegazanitekirolasu.pdf
    • http://files.marianhomes.org/uploads/1/3/1/3/131381369/3281357.pdf
    • http://resem.kalieashenden.com/uploads/1/3/1/3/131381204/tamoxapurix.pdf
    • http://xukuxoj.aardvarklearningacademy.com/uploads/1/3/1/4/131452838/b5fe07b.pdf
    • http://ruzagalu.heartconnectimproveyourlife.com/uploads/1/3/0/9/130969656/nonimulifeja.pdf
    • https://cdn.shopify.com/s/files/1/0434/2772/5474/files/feloxonig.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5044/files/liter_in_gallon.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/notupafulekatikawiduvim.pdf
    • https://cdn.shopify.com/s/files/1/0437/3744/8609/files/vekobefid.pdf
    • https://924d4470-39eb-4dcf-92c6-7e85b09604c2.filesusr.com/ugd/33ab24_3604d69d1aca4f74870f49b840e3af57.pdf?index=true
    • https://4e107858-08c5-4f48-924c-d3cbced29563.filesusr.com/ugd/e80f4c_8619193d2d904e28b005b4196173d10d.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0439/1885/2264/files/public_speaking_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0436/4333/8912/files/gettysburg_devils_den.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_off00005c8e.bin
5eab9217e62803ad7f702789f4c7c7992901d1287881a71e251464bd08fc7f78
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8E 5352 bytes
font_01_sfnt_off00006ece.bin
159024d09b1a695dbc27c659acc6fb058da49fd7bf91a17688d696d62b826983
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECE 10092 bytes