Malicious PDF — malware analysis report

Static analysis result for SHA-256 8780ecc1ef10b792…

MALICIOUS

PDF

47.3 KB Created: 2020-08-11 23:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1945895df4610cb1b95573033b4b821a SHA-1: 97cb36a6ddf96b05369b199efcd96215fa9e0516 SHA-256: 8780ecc1ef10b792c77683adc1095eb616d0543da021e4a4c80e8506d608440a
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link redirecting to a known malicious domain (ttraff.com). The document body, though partially corrupted, contains text related to 'Tally interview questions', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links indicates a link farm or redirection strategy to distribute further payloads.

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=tally+interview+questions+and+answers+for+freshers+pdf
    • http://files.goodlyframe.org/uploads/1/3/1/1/131164120/8563966.pdf
    • http://vejatisir.egfhc.com/uploads/1/3/2/3/132303382/7971862.pdf
    • http://files.eastprospectparade.org/uploads/1/3/1/3/131398406/4654654.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/35086752374.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4167/files/94799295248.pdf
    • https://cdn.shopify.com/s/files/1/0432/4687/8882/files/91550784775.pdf
    • https://cdn.shopify.com/s/files/1/0439/4595/1400/files/tetebinoxafewabevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4733/files/ditimifuxuxidowu.pdf
    • https://cdn.shopify.com/s/files/1/0452/2046/2743/files/biomassa_de_banana_verde_beneficios.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/a_way_with_words_podcast.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/83266057750.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/navowaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3250/files/30485076905.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/juxigexozofojibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3095/files/tigebi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9118/2243/files/sally_beauty_employment_application.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_off000079dd.bin
f339f79bd0ac692acd28f968e0105757b32bf6547cc88e8250fe619bd8372e38
pdf-font-stream PDF embedded font (sfnt) at offset 0x79DD 5460 bytes
font_01_sfnt_off00008c7d.bin
2109ece7ed20dece46519ff0bf40482ece128f8572502ce965beec67cfebe15d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7D 10224 bytes