Malicious PDF — malware analysis report

Static analysis result for SHA-256 add9711aa644f853…

MALICIOUS

PDF

65.4 KB Created: 2020-07-29 20:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd92d2a70977b5db0e88c39650e30c3b SHA-1: a98d4a17629162482fd65cfb93f09e2a2b7e26ce SHA-256: add9711aa644f853586fcba90161d23138bb6ef1850784b12e14b699135cf46d
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious and contains numerous embedded URLs. One URL, 'https://ttraff.ru/pify?keyword=mesotelioma+tratamiento+pdf', is identified as a known malicious redirector. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, likely intended to drive traffic to malicious infrastructure or to distribute further malware. No scripts were extracted from this sample.

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.ru/pify?keyword=mesotelioma+tratamiento+pdf
    • http://files.miacastagna.com/uploads/1/3/2/6/132695780/fofugodaxor_vupemu_zepetedod_saxozet.pdf
    • http://files.gsadaptivesports.org/uploads/1/3/1/0/131070011/1dbe53653ad0.pdf
    • http://files.mud-lusciouspotterybymichelle.com/uploads/1/3/0/8/130874480/6299362.pdf
    • http://files.johnthrasherfineart.com/uploads/1/3/1/3/131381881/mijoxekenufo.pdf
    • http://files.yogatreeonthecoast.com/uploads/1/3/0/7/130739275/45ad008.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/98911639783.pdf
    • https://cdn.shopify.com/s/files/1/0436/9468/6376/files/29433133744.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/wojebodoxozovagamexedezug.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/91029469074.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/96396203617.pdf
    • https://cdn.shopify.com/s/files/1/0429/0890/9734/files/54069814864.pdf
    • https://cdn.shopify.com/s/files/1/0429/5835/6639/files/37959365542.pdf
    • https://cdn.shopify.com/s/files/1/0432/8387/3942/files/97594266032.pdf
    • https://cdn.shopify.com/s/files/1/0430/9696/5269/files/78287532922.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/sakixarijunawofamosuxek.pdf
    • https://cdn.shopify.com/s/files/1/0432/0146/2436/files/xunuzuxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1813/3405/files/41997971830.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/973345145.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/lenemumuvogefe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://medlineplus.gov/spanish/mesothelioma.html
    • 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_off0000c0ba.bin
d843790334c6507a4c8e719d1f214b7a679f4fcdc8dfc821b7119028b093382c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BA 4980 bytes
font_01_sfnt_off0000d18d.bin
494fa8463624e93bd844dbaec0c720b09726cba8e1e5c1442ad37a6c8b8527b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 11640 bytes

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