Malicious PDF — malware analysis report

Static analysis result for SHA-256 00591a4b1bb429c7…

MALICIOUS

PDF

38.6 KB Created: 2020-08-23 07:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96c154b42c0d5abb457076c5dece8f38 SHA-1: a67769fe8fac74dc52c588cd527a6c446dec8b5f SHA-256: 00591a4b1bb429c7cd40e8f0283556fe8eef55b6125272293532e444b6c35c03
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'net force and friction problems worksheet answers' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious.

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=net+force+and+friction+problems+worksheet+answers
    • http://dowuz.filgohomeinspections.com/uploads/1/3/1/1/131163667/pagutukunisuv.pdf
    • http://files.djtonetx.com/uploads/1/3/0/8/130873941/rajonalunogo.pdf
    • http://files.ufwlifestyle.com/uploads/1/3/0/8/130874676/2193738.pdf
    • http://vagurawu.dianedailydose.com/uploads/1/3/1/0/131071258/e2bb8df.pdf
    • http://nagumowe.46oakcandles.com/uploads/1/3/1/0/131070859/7560442.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/jilonik.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/97799409663.pdf
    • https://cdn.shopify.com/s/files/1/0428/6054/4156/files/22065858337.pdf
    • https://cdn.shopify.com/s/files/1/0429/5131/1513/files/english_speaking_learning_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0453/8466/3208/files/i_swear_song_mr_jatt.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/tirafeve.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/chevaliers_de_sangreal_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/0504/1051/files/nubobofiraxakokit.pdf
    • https://cdn.shopify.com/s/files/1/0431/4402/0125/files/biological_oceanography.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/nmr_spectroscopy_applications.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054f4.bin
e5b182e9f7152ac201fad298e484d869a341f300a3f9d890f8d4aeef21d0991c
pdf-font-stream PDF embedded font (sfnt) at offset 0x54F4 5660 bytes
font_01_sfnt_off0000681b.bin
10890896eed2732622956529b8fdafa9c09accd98314cf715fcfe598018aedef
pdf-font-stream PDF embedded font (sfnt) at offset 0x681B 10420 bytes