Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca28d66cab1f5031…

MALICIOUS

PDF

40.7 KB Created: 2020-08-25 12:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dad8d9b4527a5ce7eb3ce01a8cc6677d SHA-1: f10dc299a5c10f6d5cd073c44ec153e69b19def0 SHA-256: ca28d66cab1f50319d1d9621da507cefac4de9ba99fecdd9339ef116af501be0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains embedded links that lead to a redirector hosted on 'ttraff.com', disguised as an 'Alcon rebate redemption form'. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm intended to improve search engine ranking for malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive 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.com/pify?keyword=alcon+rebate+redemption+form+2019
    • http://livajetuv.nebraskansunitedforthegoodlife.net/uploads/1/3/0/7/130776031/rapokosu.pdf
    • http://files.gracemeans.com/uploads/1/3/1/8/131856247/f0f7a.pdf
    • http://zodewer.linesbyleon.com/uploads/1/3/1/6/131637308/titel-repavisiw-sosabijo.pdf
    • http://files.europeanbonsaipottercollective.com/uploads/1/3/1/6/131637362/zovujaxalevol_romop.pdf
    • https://cdn.shopify.com/s/files/1/0431/0715/6128/files/gojutidi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6399/1717/files/dededo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/vokupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1071/files/kolesonevaxulupatomoxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/pales.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/52617246440.pdf
    • https://cdn.shopify.com/s/files/1/0434/5538/1669/files/fulujimonuzegesodesewaxeg.pdf
    • https://cdn.shopify.com/s/files/1/0447/2215/9772/files/bsc_first_sem_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/sabuvezexelonajageri.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9030/files/introduction_to_algorithms_solutions_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/deveg.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/jikiz.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_off000060ac.bin
caee5dbd8f4382ebf4c5bd25651f82c08f5eedc27b981fbf9799d1461830c497
pdf-font-stream PDF embedded font (sfnt) at offset 0x60AC 5732 bytes
font_01_sfnt_off00007413.bin
a33437851ba594caf8af52cdba55054b3622b9825a6149c2bb09628dfd05f75e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7413 9936 bytes