Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d4b3850d58d783…

MALICIOUS

PDF

41.0 KB Created: 2020-08-07 08:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c0f15547a9960748fc6d3f2008eee8e SHA-1: 68b7edd3c74a1f0d608d08b30e15c6278878f0e2 SHA-256: 78d4b3850d58d783988274363cdc375aac6b99b87089b0142cb2a487284a4fcd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to host other PDFs. One of these links, https://ttraff.cc/pify?keyword=abc+chart+pdf+free, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=abc+chart+pdf+free
    • http://files.michigansnowboardmuseum.com/uploads/1/3/1/4/131483955/182843.pdf
    • http://files.creativestudio23.com/uploads/1/3/0/7/130738850/jonurisaf-tekodex.pdf
    • http://files.nutritionevangelism.com/uploads/1/3/0/7/130776517/puxejunazagiferop.pdf
    • http://files.beercityrecovery.com/uploads/1/3/0/8/130814110/gejubomuwir_zazafewimatip.pdf
    • http://files.tommyswest.com/uploads/1/3/0/7/130775232/9107567.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6259/9584/files/juneduxurufijebagekefeba.pdf
    • https://cdn.shopify.com/s/files/1/0433/8325/9301/files/professional_handbook_of_architectural_working_drawings.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65105912314.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/ted_thunder_song.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/zivedegonew.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/taxunelo.pdf
    • https://cdn.shopify.com/s/files/1/0448/5575/4914/files/days_until_pitchers_and_catchers_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/xaburasew.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2257/files/99245637061.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34993807018.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/80229684025.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/83557791859.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/gastritis_por_helicobacter_pylori_tratamiento.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_off000062b5.bin
8391b6f87dc6eb12fee31a67413d62a4f28d6142b464264b73833a4edea49642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B5 5164 bytes
font_01_sfnt_off0000743c.bin
bf919792f388cc29f1a10d1ed2961148d48160ca48f416e561b28cb290ec728c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743C 10340 bytes

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