Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d129dd4cab9595…

MALICIOUS

PDF

110.7 KB Created: 2020-08-31 10:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2328cb6c22020ddabee3ed40864b8839 SHA-1: 8094b3ac49d377f5a29e58662bb49bf245ad50bc SHA-256: 22d129dd4cab9595ff7c5bc3c9355a105f73b11a0d28464c8da1cc7c4f325ff9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that, when clicked, redirects to a URL associated with malicious redirector infrastructure. The document body text, though heavily obfuscated, contains the same lure text as the URL, suggesting a social engineering attempt to trick users into downloading malware. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=mortal+kombat+11+free+download+pc
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/averages_and_range_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/gobid.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/3491280214.pdf
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/ooga_chaka_lyrics.pdf
    • https://static.usrfiles.com/ugd/b8c837_951a8be07acc42fcb0759543a8036017.pdf
    • https://static.usrfiles.com/ugd/e8506d_132f8dcc8b7a4ab6831b2d39c38c7e97.pdf
    • https://static.usrfiles.com/ugd/078c79_b323d60fd93549db915568b2c6c47aa4.pdf
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/weniranolomugifipovojalev.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/novurufasavezol.pdf
    • https://cdn.shopify.com/s/files/1/0459/9906/3199/files/farobomesemar.pdf
    • https://cdn.shopify.com/s/files/1/0434/4561/6792/files/worth_it_full_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/space_station_13_colonial_marines_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/2076/0741/files/kaviwizewizabibazubimikan.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6405/files/nonisudub.pdf
    • https://cdn.shopify.com/s/files/1/0436/1751/7725/files/64851644176.pdf
    • https://cdn.shopify.com/s/files/1/0429/2299/9964/files/60152966721.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_off00016610.bin
0c8a04f8decd3e6c6277b564ca9431583ba16e34b27478430d53324cb86cfdde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16610 3436 bytes
font_01_sfnt_off0001725d.bin
96a6d0d8cad8c03890c0cf4518ed21f59bb46fd6c89b4624e4964b669f41625e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1725D 5476 bytes
font_02_sfnt_off00018508.bin
3caf0a537cd158721e3669c03baf49ae26c06a948302f8061550bd497237f45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18508 12140 bytes

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