Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c4c5093329c126…

MALICIOUS

PDF

36.4 KB Created: 2020-08-24 20:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0cc2b1147fca868663aaccf80a94687 SHA-1: 86a17c26b95f26e6ee2dd0d546feb058d17a84c4 SHA-256: c7c4c5093329c1260d7be7541a2be6827c3d32f31bb60fee14d3fae056ad59ec
150 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, which points to a URL that appears to be part of a link farm designed to distribute SEO-poisoned content. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to download content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=matsu+psx+emulator+free+apk
    • http://files.ivakorbar.com/uploads/1/3/0/8/130874317/c1d421.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/daybreak_series_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6647/files/54760018297.pdf
    • https://cdn.shopify.com/s/files/1/0436/8377/4614/files/53966237226.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/zonerupizav.pdf
    • https://cdn.shopify.com/s/files/1/0432/3373/8911/files/altstadtfest_jena_2019_programm.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/xinofivuzes.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7151/files/35023857075.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/65417524072.pdf
    • https://cdn.shopify.com/s/files/1/0433/1582/2747/files/66552092254.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/41513833320.pdf
    • https://cdn.shopify.com/s/files/1/0446/7264/7331/files/spss_qualitative_data_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/hgec_better_bouncing_boobs_hcup_ecup_dcup.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/add_to_kindle_cloud_reader.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_off00004d3f.bin
fa72033f898dc1728cb6c39884f9f8bdb16995ce87fdcee3e35e15c159dcc976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D3F 5184 bytes
font_01_sfnt_off00005edd.bin
7ab79eca0f4e82d8e17d2fad8c5f2a9779a243380dc951409dcd416ea01510d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDD 12724 bytes

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