Malicious PDF — malware analysis report

Static analysis result for SHA-256 da863d899359a5db…

MALICIOUS

PDF

34.4 KB Created: 2020-08-25 18:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e931bd1f6271b8405ecabc0ad7d22f08 SHA-1: 441aadcf0eb34b9172e65f272b5804047600dd37 SHA-256: da863d899359a5dbc59321bad04dcd7164aec0217ff42f750b02df57e4acc588
194 Risk Score

Malware Insights

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

The PDF contains multiple invisible links, one of which redirects to known malicious infrastructure at 'https://ttraff.cc/pify?keyword=kpss+a+grubu+deneme'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on cdn.shopify.com, indicates a link farm strategy to obscure the malicious redirector. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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.cc/pify?keyword=kpss+a+grubu+deneme
    • http://bedalepor.flowersfromsarahsgarden.com/uploads/1/3/2/8/132814977/jusiviwo-pujozuwodofax-bepunawa-vutadesimuzu.pdf
    • http://files.ellielomas.com/uploads/1/3/0/8/130814682/mibuv.pdf
    • http://files.rideroughnremote.com/uploads/1/3/1/6/131637362/2713024.pdf
    • http://fujex.escnhwy32.com/uploads/1/3/0/7/130739415/8403871.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5351/files/rilaxidakemugowazizu.pdf
    • https://cdn.shopify.com/s/files/1/0449/1676/8923/files/innova_3320_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8067/files/5046420866.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/kesezaz.pdf
    • https://cdn.shopify.com/s/files/1/0439/6243/3694/files/78699509477.pdf
    • https://cdn.shopify.com/s/files/1/0430/9539/2409/files/film_bad_genius_sub_indo_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0460/2514/6527/files/tchaikovsky_sheet_music_violin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdf
    • https://cdn.shopify.com/s/files/1/0460/3546/8452/files/captcha_code_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/1538/8840/files/vifetuvex.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_off00004a1c.bin
828a8b2aa57abc20fe7f4d0888815ab2d871721af064c3a79724d5c75c88d20d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A1C 5356 bytes
font_01_sfnt_off00005c37.bin
0d3bd976307500ccb63ce41431ec8c1370e1bc43ee92cc41736d03e56edd412e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C37 10048 bytes

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