Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d9e41060e42caf…

MALICIOUS

PDF

33.6 KB Created: 2020-09-07 02:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d71e04839768935fede9eb7e198380e8 SHA-1: 3b4cee7085aef2a7b886893fda91f05cdc0ab6f6 SHA-256: c1d9e41060e42cafba809a4a2bc583d3b4363d58793a6facf6ef0cd3deea686b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=vevo+music+app+android'. This, combined with a high ML classifier score and a PDF link farm heuristic, strongly suggests the document's purpose is to redirect users to a malicious destination. The document body contains garbled text but includes the malicious URL and several benign Shopify URLs, likely part of a link farm.

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=vevo+music+app+android
    • https://cdn.shopify.com/s/files/1/0433/9597/3271/files/39612598746.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/33564061272.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3910/files/26853434112.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4236/files/android_network_sniffing_app.pdf
    • https://cdn.shopify.com/s/files/1/0433/8388/1893/files/kipewexisewe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/intel_processors_performance_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/futoditobusazefud.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/tenuberimitikorepofam.pdf
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/ascom_phone_user_manual.pdf
    • https://static.usrfiles.com/ugd/f2ef67_5359c9454efa4d71979df6ea670f8e3e.pdf
    • https://static.usrfiles.com/ugd/3bcfef_4487a6c1a5fc405d991a013f5418be92.pdf
    • https://static.usrfiles.com/ugd/278743_a9724daa474e4f0a845a4fc97cca108d.pdf
    • https://cdn.shopify.com/s/files/1/0463/3339/5099/files/wepore.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/pezuvalorugapudume.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/guideline_amniotic_fluid_embolism.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_off0000448a.bin
a35a20c1bb87e7778359162dc2e968f2101cdfe3d36fa5dc305e4dcf91d217ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x448A 5212 bytes
font_01_sfnt_off00005636.bin
0c86d786bb685fe9a83e7fc449cfdd50da233eeb1611897789d91e3ce7366a81
pdf-font-stream PDF embedded font (sfnt) at offset 0x5636 10064 bytes