Malicious PDF — malware analysis report

Static analysis result for SHA-256 289f433a3f3cf5b6…

MALICIOUS

PDF

42.2 KB Created: 2020-08-19 11:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19fbf85293bc85829460686ce41308a3 SHA-1: e45949d99dc978dec14c17d5673e2c62385ae3f4 SHA-256: 289f433a3f3cf5b60664a791590be4d51c1447f36ee3ff249f4a7f7a8d01a3e7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of these links, https://ttraff.cc/pify?keyword=compare+2+excel+spreadsheets+for+matches, is identified as a malicious redirector. The document body, though partially corrupted, contains text related to comparing spreadsheets and the malicious URL, suggesting a social engineering lure to drive traffic to the redirector. 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=compare+2+excel+spreadsheets+for+matches
    • http://files.momsarefrommars.com/uploads/1/3/1/4/131406885/pazojesazopax-fenutezozil-bakebivug.pdf
    • http://files.geoarchnewmexico.com/uploads/1/3/1/8/131872055/8650182.pdf
    • https://cdn.shopify.com/s/files/1/0439/9664/3486/files/vakaweleraloge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3883/files/hormuz_eu4_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/72923448462.pdf
    • https://cdn.shopify.com/s/files/1/0437/9574/2882/files/82070704741.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/attributes_of_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0841/files/windows_movie_maker_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/kimikarululoziwigelove.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/11502733781.pdf
    • https://cdn.shopify.com/s/files/1/0448/9166/8647/files/3201891300.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0591/files/82624427236.pdf
    • https://cdn.shopify.com/s/files/1/0450/2428/0726/files/metro_map_delhi_download_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/3143/6186/files/nodanawawoveralu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/jovemitatijonirutazapixa.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_off0000663f.bin
ed9fcdf54e875139fcdcb28c9d0665148576183c79dd193cc6bfeef58e7bc2ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663F 5500 bytes
font_01_sfnt_off000078cb.bin
ed768ee4673ff196a9b6b487c9d7d9d2eb7f2b6f61f69caffff8e7108f03e902		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CB 10224 bytes

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