Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2ed03cad92a8f6…

MALICIOUS

PDF

56.4 KB Created: 2020-08-25 03:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cc3ec6acc3f358a7ecdaf03badca17c SHA-1: 87bb974376ed336ebac88ec816b6b5270d83a537 SHA-256: 1a2ed03cad92a8f6b150302a2032d2e3defdf4ba9972a2c3118ad7ec07a87493
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, many of which are hosted on Shopify, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the distribution of malicious links within the document.

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=hide+action+bar+android+appcompatactivity
    • http://files.fjhcoinsandstuff.com/uploads/1/3/1/4/131483254/1c39ac1b5a.pdf
    • http://jolutuz.littleoasisequine.com/uploads/1/3/1/4/131454950/8130861.pdf
    • http://files.cosmicaes.com/uploads/1/3/0/7/130776755/8fad464f7.pdf
    • http://files.davidftown.com/uploads/1/3/2/6/132696214/4379684.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/97638367458.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2759/files/termo_de_assentimento_livre_e_esclarecido.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2231/files/55779663255.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/78485804145.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/16508488169.pdf
    • https://cdn.shopify.com/s/files/1/0436/0005/2387/files/milib.pdf
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/96497097.pdf
    • https://cdn.shopify.com/s/files/1/0440/2174/3781/files/scp_cb_ntf_mod.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/39660909012.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/mafirapovowixivavub.pdf
    • https://cdn.shopify.com/s/files/1/0434/3421/3542/files/advanced_vocabulary_test_with_answers.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071c5.bin
fe48955754144f4fc9e2cf099e04665ce6e4b77144c5d7690194e4d749d3fd0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C5 4868 bytes
font_01_sfnt_off000082c7.bin
94d1a7ad8524b99171c7483a32b8fb1ac288a5c19b7f7b772a691fbd2a158e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C7 5060 bytes
font_02_sfnt_off000093d6.bin
aaea31f405defcc36143ee8e9a5ef9edf6015feeb90a97216750cca7911860a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93D6 16256 bytes
font_03_sfnt_off0000c5f6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F6 4324 bytes

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