Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cecd5e1757ba02…

MALICIOUS

PDF

46.3 KB Created: 2020-08-19 19:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdf2ac6357adaf2913be1d634f58bb91 SHA-1: 353b166fcddabc95b9939cbb7ebf526555bca8c5 SHA-256: a3cecd5e1757ba026fc021d0d96878d8973df282cc90020d2f9bd0582b440fd0
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=socratic+seminar+rules+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of the redirection chain. The presence of numerous PDF links suggests an attempt to distribute malicious content or engage in SEO abuse for traffic generation.

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=socratic+seminar+rules+pdf
    • http://files.thomfogartypresents.com/uploads/1/3/0/7/130740173/datuwamajefus.pdf
    • http://files.drbgeography.com/uploads/1/3/2/8/132814476/maditopiripukof-xowafuxuwub-lefamonaxoroj.pdf
    • http://files.kanawhavalleychurch.org/uploads/1/3/1/3/131398140/6626987895.pdf
    • http://files.cheskasstore.net/uploads/1/3/1/4/131407042/fodomelir.pdf
    • http://gikivux.adamkk.com/uploads/1/3/0/7/130738850/7510985.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7144/files/george_strait_run_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1110/files/chronic_charcot_deformity.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0413/files/76991203466.pdf
    • https://cdn.shopify.com/s/files/1/0438/3165/6605/files/mebogusenebudatorajixibom.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/65326233819.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/pdf_fillable_da_31.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3239/files/velexugojewakorumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunazazaxukatokezidabu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/problem_solving_approaches.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdf
    • https://cdn.shopify.com/s/files/1/0427/6997/3415/files/doditumugesaxum.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2967/files/cursive_bed_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/3839/8869/files/convert_to_infopath.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_off0000788a.bin
a085017bb1bafafe4fbfe0c5a57536990d7f388138e9433eb16c1222549597df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788A 5404 bytes
font_01_sfnt_off00008ac3.bin
721186f893e41b89082d5c96f03ab75d6feacdd644e6c087cd82c9eb4f1ace03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC3 9808 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.