Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c4400ec482d42c…

MALICIOUS

PDF

38.1 KB Created: 2020-08-07 06:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22ae05799a55708f32d89f978aea5972 SHA-1: f9278c5dfc2a9691c3355955b0eaf33937bd2ad6 SHA-256: a8c4400ec482d42cb46173fe5b55b1dbf924bfd2f2e82de6778903b79b1a618f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=acr+manual+on+contrast+media+pdf'. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify domains, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which likely leads to further malicious content or phishing pages.

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=acr+manual+on+contrast+media+pdf
    • http://files.littlesproutshk.com/uploads/1/3/1/6/131606636/258441.pdf
    • http://files.debbieclaxton.co.uk/uploads/1/3/2/6/132695280/getaxofilesu_lewumagipusegi.pdf
    • http://files.ls2dealer.com/uploads/1/3/2/6/132695569/kafumixavizojalodo.pdf
    • http://pejetewu.shaeshaeshae.com/uploads/1/3/2/6/132681670/61e96.pdf
    • https://cdn.shopify.com/s/files/1/0435/0479/5800/files/86491723477.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/45304012341.pdf
    • https://cdn.shopify.com/s/files/1/0435/3101/0199/files/raregerinebukajeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/3794/1160/files/vawiviz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/rujaguxirejuxorofijasij.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/conversor_analogico_digital.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/52945803980.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/freddie_gray_autopsy_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/86451701196.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4495/files/lomuso.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/tugofi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64255738852.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6646/files/applied_algebra_and_functional_analysis.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_off00004add.bin
6b81c02124c0c333a9111444d682ec7d19f95159003072290845dacc90f19c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADD 5172 bytes
font_01_sfnt_off00005c4c.bin
84cdca40ded85f10026ec428de7dfb2c368a649d23671a163c2d1b8af38b0f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4C 9688 bytes
font_02_sfnt_off00007d73.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D73 4324 bytes

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