Malicious PDF — malware analysis report

Static analysis result for SHA-256 4775f0648bed089f…

MALICIOUS

PDF

51.5 KB Created: 2020-08-18 19:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5c9d6bfd0955bd7db2d54d4d311b6cf SHA-1: b8aa4ed3645b730bb8eac067db22cdfc800f1615 SHA-256: 4775f0648bed089f25a083d4df1a8f852134005ee305e54de7c3d7f8bd450ff3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to sports results and a URL that matches the malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a link farm designed to redirect users to malicious content.

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=england+championship+results+table+and+form
    • http://gutufu.pixelsblogusa.com/uploads/1/3/1/4/131453177/jofolulozede_zosivamusobates_ranuporojusalo_baxenetep.pdf
    • http://files.psispyinc.com/uploads/1/3/1/6/131637606/80c93f10.pdf
    • http://files.risingtidelabradors.com/uploads/1/3/2/7/132740480/3408556.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/malugul.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/wumone.pdf
    • https://cdn.shopify.com/s/files/1/0429/6753/1673/files/banting_green_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/rusobola.pdf
    • https://cdn.shopify.com/s/files/1/0432/4543/7083/files/butikada.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/zexixikikevuva.pdf
    • https://cdn.shopify.com/s/files/1/0435/7190/4673/files/11788909197.pdf
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/heart_shaped_box_tab.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/xifusigoxepi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0841/6165/files/logical_reasoning_questions_and_answers_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0446/1314/0643/files/angielski_kurs_dla_wiecznie_pocztkujcych_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/34396267474.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073c7.bin
a7fc0bf203cab985421698a07f0a7f80e760c9c0d0f366ebccc60fb8bfc69081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C7 5548 bytes
font_01_sfnt_off0000866a.bin
198218fdd38dc26f4df282bd324d3a210145b703249107bf940c9297e1f3c3a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x866A 13808 bytes
font_02_sfnt_off0000b24d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 4324 bytes

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