Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0eec630dba9611…

MALICIOUS

PDF

39.1 KB Created: 2020-08-04 22:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d1a446fc4e7234351ae78f9d3c0b0b SHA-1: e0ac2712c45b65907701f3f4232e2cbb33351dbf SHA-256: dc0eec630dba9611d2c5d511ac65097fa069af567160c92a21140b94c6ac2a6c
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which point to a link farm hosted on Shopify. One of the primary URLs, https://ttraff.cc/pify?keyword=antenatal+care+pdf+download, is identified as a malicious redirector. The document body, though partially corrupted, contains text related to "antenatal care pdf download", suggesting a lure to trick users into clicking the malicious link. The ML classifier 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=antenatal+care+pdf+download
    • http://files.wowpartyrentals.org/uploads/1/3/0/8/130814058/fuxejikuravewo.pdf
    • http://files.perrasjewellerydesign.ca/uploads/1/3/2/3/132302872/688e963c79f3f7.pdf
    • http://files.ross-lorraine.com/uploads/1/3/2/7/132712206/dibobi.pdf
    • http://files.pettswoodrunners.org/uploads/1/3/1/4/131411199/a68c1d92c6.pdf
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/larimibufatogev.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/32965383450.pdf
    • https://cdn.shopify.com/s/files/1/0431/6915/3181/files/gedefapisoxilixafojuzosiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8196/5461/files/70428808445.pdf
    • https://cdn.shopify.com/s/files/1/0434/7379/7285/files/94785308255.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9873/files/wafavuxivevekovane.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riginijulu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/mufifiris.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6090/files/ketakijuxuxebexapu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/82267755073.pdf
    • https://cdn.shopify.com/s/files/1/0433/8611/0110/files/react_button_onclick.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2767/files/jopive.pdf
    • https://cdn.shopify.com/s/files/1/0436/8013/7369/files/mojoxajarivigugebana.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_off00004f3a.bin
6181e6c4bda3b0b0e9dbee4706017e8b08fd54efeb9f374a486ab07087bb9f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F3A 4792 bytes
font_01_sfnt_off00005f99.bin
9abe35439e242ab56de0ab252955764713e3781c9a1a43971278941d7ad3f365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F99 9848 bytes
font_02_sfnt_off00008153.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8153 4324 bytes

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