Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f52445ff1e8514f…

MALICIOUS

PDF

40.2 KB Created: 2020-08-21 03:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9957d6e6707c345774f828b2bfa7e0d SHA-1: 1eb835075f80eda989a25ac85c807a7e4a03c6a9 SHA-256: 9f52445ff1e8514f8a3c10f5298537e1002cdab119a28cfa5fc9c6ec30326e18
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, forming a link farm. One of these links, https://ttraff.ru/pify?keyword=braveheart+soundtrack+free, is identified as a known malicious redirector. This suggests the document's primary purpose is to lure users through a chain of redirects, likely leading to a phishing page or malware download. The ML classifier strongly supports the malicious nature of this PDF.

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=braveheart+soundtrack+free
    • http://files.innervoyages.com.au/uploads/1/3/2/8/132815359/tesovenupatuper.pdf
    • http://teniv.dogwittraining.com/uploads/1/3/2/6/132681556/jidabidemususujik.pdf
    • http://bevefive.sarpc.net/uploads/1/3/0/7/130776228/lonuxuj.pdf
    • http://xanubato.psychotherapy121.com/uploads/1/3/1/1/131164250/1295398.pdf
    • http://jevapud.bluesandcollection.com/uploads/1/3/2/8/132815028/e0e1fbaaa7159e.pdf
    • https://cdn.shopify.com/s/files/1/0438/2703/6322/files/vizixibuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/sotajabu.pdf
    • https://cdn.shopify.com/s/files/1/0454/5445/9030/files/digium_asterisk_gui.pdf
    • https://cdn.shopify.com/s/files/1/0449/2325/6999/files/antifungal_drugs_mechanism_of_action.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/dolifomagomexuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/2818930821.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/jasebagagegiguwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/bawarepatunafenabix.pdf
    • https://cdn.shopify.com/s/files/1/0440/2210/4222/files/lufosumad.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2103/files/2025717915.pdf
    • https://cdn.shopify.com/s/files/1/0428/6332/9446/files/biographies_of_great_christian_leaders.pdf
    • https://cdn.shopify.com/s/files/1/0433/3935/0181/files/kexupazuvaguvo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/maria_west_side_story_piano_sheet_music.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_off00005f1d.bin
2b24e2ba6d2e227d6e4120054be392f6d722016321f510bc85afcdfc76233be5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1D 5248 bytes
font_01_sfnt_off000070f4.bin
0303825dbceee31bff808a4b9fa2eb65693d4e14d0334e2a8edb0e28143e51dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F4 10428 bytes

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