Malicious PDF — malware analysis report

Static analysis result for SHA-256 1615a7cce76505fd…

MALICIOUS

PDF

47.9 KB Created: 2020-08-15 23:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83e0b07acc43f6fe1cd3aec29922fc0c SHA-1: dee54debf9081914f61766f5203bc945f86d3f5d SHA-256: 1615a7cce76505fd96af184ef39ed2d37b2c247cc8084047c5842f18031940c1
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though partially garbled, includes the same URL and text as the malicious link, indicating an attempt to trick users into visiting a harmful site. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=los%204%20convenios%20de%20ginebra%20pdf
    • http://parujife.agiteysirva.com/uploads/1/3/0/7/130776433/toxiwozek-vazisexifepexif.pdf
    • http://files.baonenterprises.com/uploads/1/3/1/8/131856627/tokimozozez.pdf
    • http://tudeb.efrfire.com/uploads/1/3/0/7/130739169/nosalozedujib.pdf
    • http://files.justtreesuk.com/uploads/1/3/1/6/131636843/vatod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/92385969891.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5031/files/26280511325.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/43748689561.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/23499138714.pdf
    • https://cdn.shopify.com/s/files/1/0428/6706/4991/files/foxunoxuguganeru.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/42857621444.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/86358534935.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/principle_of_spectrophotometer_beer_lambert_law.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/os_anexos_da_pele.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/medical_aspects_of_chemical_and_biological_warfare.pdf
    • https://cdn.shopify.com/s/files/1/0435/3789/1482/files/sony_xs_r1645.pdf
    • https://cdn.shopify.com/s/files/1/0439/4975/2478/files/20382987721.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0374/files/65339203437.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ffc.bin
a3efc9cdcdf40e3e60d6cbc64fb1f0198e2d66f98da49c0b52ea10478af25b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFC 5228 bytes
font_01_sfnt_off000081d0.bin
853319cedbbb7fd8fdc6c107c61ed068fcf3c95e726177c3a45ed89341536f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D0 10756 bytes
font_02_sfnt_off0000a4ab.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4AB 4324 bytes

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