Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1daeefbca14946…

MALICIOUS

PDF

45.1 KB Created: 2020-08-08 18:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f57329c99d5f3854287281d108b62393 SHA-1: da031916aa89765324e9e430ed2267c3fe4d07ce SHA-256: ac1daeefbca149461cca3dc3e27cc06a7f5b62e8a6b8905874465e20ab79bb5c
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 malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains the text 'one way anova calculation pdf' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via these links.

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=one+way+anova+calculation+pdf
    • http://files.tntdeesign.com/uploads/1/3/0/7/130776503/jawipuk-bonusotiv.pdf
    • http://kogiparo.gonglumvrice.com/uploads/1/3/1/6/131606758/fekimeziwutef_wivajagovibafab_konat_gakunezopem.pdf
    • http://files.comealiveart.com/uploads/1/3/1/6/131637055/pitewegotimu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/savapovorok.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/69657776792.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/vusenap.pdf
    • https://cdn.shopify.com/s/files/1/0433/9964/3286/files/14409272591.pdf
    • https://cdn.shopify.com/s/files/1/0435/9910/2110/files/25413454117.pdf
    • https://cdn.shopify.com/s/files/1/0440/3144/3094/files/70866767654.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/nimadone.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/69241267226.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/falinakasorodose.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/30428859182.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/zikukavabitowejoviw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9216/5279/files/xinojita.pdf
    • https://cdn.shopify.com/s/files/1/0435/5325/9679/files/66456084952.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/xoratejemawusaje.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b44.bin
784311d69bbc3817ade83c9538618a1e5141eaed3d0e2ad5c0cb61baad95366f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B44 5040 bytes
font_01_sfnt_off00006c9b.bin
800f4a3e5742cea45191a562ade7b601234b3becf263a53e002a4049cd52afda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9B 14360 bytes
font_02_sfnt_off00009929.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9929 4324 bytes

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