Malicious PDF — malware analysis report

Static analysis result for SHA-256 9204815a17a3dba1…

MALICIOUS

PDF

43.4 KB Created: 2020-08-14 05:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f6aeef84abe917d028c9a4674b9b9e2 SHA-1: 18f916fccd5b2c4d9257a6727547b4b7ecb19403 SHA-256: 9204815a17a3dba1e81422ec29aedbbf70bc4a28c241fab9664c14f15b60096b
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 external PDF files hosted on Shopify. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=cat%25C3%25A1logo+mary+kay+julho+2019+pdf'. This suggests a link farm or SEO poisoning attack designed to lure users to malicious sites. The ML classifier also 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=cat%25C3%25A1logo+mary+kay+julho+2019+pdf
    • http://dexemizu.neatshomegarden.com/uploads/1/3/1/3/131398504/poviru-delejefimur.pdf
    • http://files.manyblessingsministry.com/uploads/1/3/0/7/130739247/5156351.pdf
    • http://files.telezapper.com/uploads/1/3/1/3/131384156/3242705.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/povekow.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/begovoboxesujuseruzinoku.pdf
    • https://cdn.shopify.com/s/files/1/0434/8982/0836/files/integration_area_under_curve_problems.pdf
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/dikuvafidojej.pdf
    • https://cdn.shopify.com/s/files/1/0435/1531/4330/files/11925743602.pdf
    • https://cdn.shopify.com/s/files/1/0429/3240/4380/files/merobonelokajovisomel.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1054/files/ladelowerokaxezedijiwoti.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/tirajixuvozelokuvon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87277754858.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5454/files/76578693552.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/43159208039.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/vukumitikut.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/kabap.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/62479403667.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_off0000672c.bin
afcc8aef62dc33f53fdd0923373a3ebe5e44769a71ceb3bca82d1fb01cf63e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672C 6140 bytes
font_01_sfnt_off00007b83.bin
cf459ea545b82fc259f2bdd9cb674980d818c318a2d81709bb57bd3d9ccd941c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B83 10344 bytes

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