Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdb12eed2db0d28…

MALICIOUS

PDF

64.7 KB Created: 2020-09-03 19:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0af654f52b6c72af104a369b73e1e696 SHA-1: eef24158b83dd167a394ed6b322515edef353560 SHA-256: 4bdb12eed2db0d28f30ae5ba81c963c6c0b74f45f10917c59ec60a8eb1f97372
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=bonafide+student+certificate+form+pdf'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, further indicates a link farm or SEO poisoning attempt to increase visibility. The ML classifier also 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.link/wix?keyword=bonafide+student+certificate+form+pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/xalexibope.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/bifuwijusumimar.pdf
    • https://cdn.shopify.com/s/files/1/0434/6596/5718/files/dearly_beloved_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/4800/8866/files/20433942414.pdf
    • https://cdn.shopify.com/s/files/1/0431/5706/1788/files/zodosomifemaliliselosos.pdf
    • https://cdn.shopify.com/s/files/1/0433/6415/5560/files/bukuvubuwojidilasajopomi.pdf
    • https://static.usrfiles.com/ugd/269bb8_0eaf3623b6db47b29c0290af013966e3.pdf
    • https://static.usrfiles.com/ugd/cac9e4_27b2fd9d4c344e92917e724565799f57.pdf
    • https://cdn.shopify.com/s/files/1/0431/0948/2658/files/95679506077.pdf
    • https://cdn.shopify.com/s/files/1/0432/2046/7869/files/algebra_2_workbook_answers_slader.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/mekanisme_pingsan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8d3.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D3 2828 bytes
font_01_sfnt_off0000b2cd.bin
4b647812fb44694f4b8977aeee20175d545fbc00fbe0babc0067589ba1db1a19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CD 5200 bytes
font_02_sfnt_off0000c462.bin
c517b281f9b0f42a886b343e3ddd6b1bfd1117b29b1810a4ce98fa82bfc4bd6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC462 10176 bytes
font_03_sfnt_off0000e70d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 4324 bytes

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