Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c404dae540e12ba…

MALICIOUS

PDF

48.2 KB Created: 2020-08-08 04:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2357d8156952769e8df023341278c440 SHA-1: 1125ddd107937bfa5c5d950ec4f9f27f6b549fe4 SHA-256: 8c404dae540e12ba034f88f9a9c30ab6c4f1927fbf760d18bea0d30116c8f379
154 Risk Score

Malware Insights

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

The PDF contains a high number of links to external resources, many of which are hosted on Shopify domains but appear to be part of a link farm. A critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the malicious URL and references to PDF file downloads, supporting the lure.

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=html+codes+pdf+file+download
    • http://files.kkantoinette.com/uploads/1/3/1/3/131383613/9682222.pdf
    • http://vitin.theandywallace.com/uploads/1/3/1/0/131069934/99f4a559059.pdf
    • http://files.debbiejohnsonauthor.com/uploads/1/3/0/7/130738812/zenagisamimuzefo.pdf
    • http://files.peeldistrictslac.com/uploads/1/3/2/3/132303388/wagerigipobami.pdf
    • http://bifubigo.simplyinspiringimages.com/uploads/1/3/1/4/131408027/bafevalibujod_murisupalis_lapogumobife.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7474/files/joindre_plusieurs_en_un.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/11877424462.pdf
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/chemistry_a_molecular_approach_4th_edition_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/gst_amendments_for_may_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/4167476653.pdf
    • https://cdn.shopify.com/s/files/1/0438/2441/4882/files/ballade_pour_adeline_sheet_music_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/figitamijelitu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/59725359762.pdf
    • https://cdn.shopify.com/s/files/1/0451/0292/3939/files/analysis_and_design_of_parallel_algorithms_lakshmivarahan.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0077/files/movesorijidod.pdf
    • https://cdn.shopify.com/s/files/1/0438/4001/2450/files/76384363941.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/17082687466.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5554/files/48659975610.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/anatomy_and_physiology_of_speech_language_and_hearing.pdf
    • https://cdn.shopify.com/s/files/1/0437/7611/4837/files/36594891947.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_off000067a8.bin
b4bd0245c3262686b94963cac7d3afa4de8297b50a60bf07911fb90adbc02dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A8 5256 bytes
font_01_sfnt_off0000798e.bin
9ae7d9f1e6814b7e68cdad48c7bc667ee9f9b9cc85aa57d522090376183b9027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798E 19548 bytes

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