Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef82b857078caed…

MALICIOUS

PDF

44.4 KB Created: 2020-08-05 06:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16670d8e5a7a7047ccebf90ca084b5f0 SHA-1: 0059c55b3cb9a058a012e16c5347ae74faa05b94 SHA-256: eef82b857078caedb7e635ba39aed56bc16ead0240a32a56a7ad5f1774d6cdb6
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, includes the same URL. The presence of a large link farm, combined with the malicious redirector, strongly suggests an attempt to direct users to harmful websites. No scripts were extracted, limiting further analysis of the payload.

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=china+s+one+belt+one+road+initiative+pdf
    • http://files.beaconaccountancy.com/uploads/1/3/2/6/132680896/dogororobonikes.pdf
    • http://files.melvinrogers.site/uploads/1/3/1/4/131406140/suxaren.pdf
    • http://files.caffeamouri.com/uploads/1/3/0/7/130775953/3c023aa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7391/9393/files/asfixia_perinatal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53551688275.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/6116607525.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/7385412372.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7206/files/amalan_gaya_hidup_sihat.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4289/files/pukosefuxipawokabadanowor.pdf
    • https://cdn.shopify.com/s/files/1/0439/6479/2990/files/sodoremejuzeduko.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/lowes_newnan_ga.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6927/files/68854875917.pdf
    • https://cdn.shopify.com/s/files/1/0431/8242/4215/files/4757399052.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/lixulamotutowexubuvede.pdf
    • https://cdn.shopify.com/s/files/1/0438/6367/0944/files/6014175693.pdf
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/75640113886.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_off00006fdb.bin
ec9f0f0cb6afb590f67a48d2f3b3b04b3b9d15f7c2d81cc58c4014e93997b85c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDB 5232 bytes
font_01_sfnt_off0000819b.bin
d833f82871fab36c1eb7a88cb417d32d391983a489c1c28ddbacb41e44d6a7ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x819B 10264 bytes