Malicious PDF — malware analysis report

Static analysis result for SHA-256 0505ebec57666eea…

MALICIOUS

PDF

37.7 KB Created: 2020-08-24 06:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b32db6b686a2451aafca0e37ab5dee1 SHA-1: 67b41cf041450207742fd94aac7416050ee53a14 SHA-256: 0505ebec57666eea3c18cd8268cd600c0dcb871ae32a13cce4b8d2ef40a387fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, indicative of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=belageddu+flute+ringtone'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded links suggest an attempt to manipulate search engine results or redirect users to malicious content.

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.cc/pify?keyword=belageddu+flute+ringtone
    • http://zarar.koreanatoledo.com/uploads/1/3/1/4/131482995/b8946d7732107e3.pdf
    • http://pezanopa.ashleydoestattoos.com/uploads/1/3/0/8/130814328/94815e25.pdf
    • http://maloso.varshapremgames.com/uploads/1/3/1/6/131637814/3dafa47.pdf
    • http://files.randallterry.com/uploads/1/3/2/7/132740580/wizilebegevoxuzege.pdf
    • http://files.chromecomputers.net/uploads/1/3/1/1/131163872/1313431.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4098/0642/files/bidavuvemal.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/64371901563.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/joxudujomuwov.pdf
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/64440792623.pdf
    • https://cdn.shopify.com/s/files/1/0437/5265/2951/files/65397592759.pdf
    • https://cdn.shopify.com/s/files/1/0438/3670/2870/files/mozetapu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/aconex_training.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0441/1670/5432/files/case_files_family_medicine_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/8014/5313/files/complete_heart_block_nice_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0438/6104/9494/files/sisezub.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050e5.bin
d7e50779045b563abfa838a971719b7703ef612e7f1ee6ab720945a199ed18ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50E5 4948 bytes
font_01_sfnt_off000061c2.bin
d4b77eb3a095dbb3908af6a60915a25189a96792e9d0d66a4ec7dfd782ec82cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C2 12580 bytes

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