Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f8e2043c2ab431…

MALICIOUS

PDF

46.9 KB Created: 2020-08-07 06:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2b8ba434879cc16363beb8ca41b835a SHA-1: 440cbc35c4a067d44d0ccbfc4019ba3d86e97ba2 SHA-256: c0f8e2043c2ab43128d802c4d89aaa9b9abafa2df8d37d14fdcc6353265280a5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=amenaza+parto+pretermino+pdf+2020'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on Shopify, suggesting a link farm intended to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=amenaza+parto+pretermino+pdf+2020
    • http://files.yourresidenthistorian.com/uploads/1/3/0/8/130814596/6213931.pdf
    • http://files.stevenscoastal.com/uploads/1/3/1/3/131384777/nunudep-siran.pdf
    • http://files.allfloorsinteriors.com/uploads/1/3/0/9/130969375/kexajize.pdf
    • http://files.stefanodeflorio.com/uploads/1/3/0/7/130776041/vakokilamiroge_xizajininatuxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8748/6358/files/34526009940.pdf
    • https://cdn.shopify.com/s/files/1/0431/4680/5408/files/xiwetefomuzeramizirel.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4731/files/53153650600.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/425951473.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/pemiko.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/videpijemajezeji.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/30515318478.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/sazaxugadosiravila.pdf
    • https://cdn.shopify.com/s/files/1/0431/2698/0765/files/3602087017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/sikuxejatave.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/22099254319.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/regex_special_characters.pdf
    • https://cdn.shopify.com/s/files/1/0431/2494/9153/files/betobi.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_off00007709.bin
db2f4d42fa7f054626422db13a13c870de14a0ef2acb841f58570feb708af840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7709 5288 bytes
font_01_sfnt_off000088f8.bin
0dae7309c2e2bbeb2e5d828999af815605c40d8a164407d313ccae74528839c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88F8 10896 bytes

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