Malicious PDF — malware analysis report

Static analysis result for SHA-256 c806b997295a89eb…

MALICIOUS

PDF

38.7 KB Created: 2020-09-06 15:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f597ce5cf9c621a901325d7f6ee2d374 SHA-1: 25d1ffba430f576de9f37681a9b71f7ff6cd3202 SHA-256: c806b997295a89eb793a5da715394a397a46a4ae562ad56e122d94e307003f21
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=stop+auto++in+windows+10'. This URL is likely part of a phishing or malware distribution chain. The PDF also contains a large number of embedded links, flagged as a link farm, with many pointing to shopify.com. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence for a malicious attack pattern.

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=stop+auto++in+windows+10
    • https://cdn.shopify.com/s/files/1/0431/5542/3383/files/45063650208.pdf
    • https://cdn.shopify.com/s/files/1/0437/8096/4509/files/deep_sleep_battery_saver_pro_apk_cracked.pdf
    • https://cdn.shopify.com/s/files/1/0430/8064/6807/files/26828698974.pdf
    • https://cdn.shopify.com/s/files/1/0440/3704/6422/files/va_form_10-_7959c.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6561/files/acute_stroke_guidelines_2017.pdf
    • https://cdn.shopify.com/s/files/1/0461/5520/2723/files/advantages_of_studying_abroad_essay.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/chillara_gang_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0439/7747/4206/files/french_horn_harry_potter_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/6202/4605/files/counterparty_credit_risk_eduardo_canabarro.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/96121505583.pdf
    • https://static.usrfiles.com/ugd/b8c837_c207b765a0f34def87e54e84cc07233c.pdf
    • https://static.usrfiles.com/ugd/55cc32_fbda8e58b6504abf8f4aac36fe10a7e6.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_off00005ac7.bin
a556d7dd4f310363a869c7d879abdf1bcb13d0e23a38d0399073cfd28f2f958a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC7 5212 bytes
font_01_sfnt_off00006cac.bin
236551a104cfbcad77c5e5ac3ca5afa2198ce9a6677ca91ad78b12a6452fa116
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAC 9852 bytes