Malicious PDF — malware analysis report

Static analysis result for SHA-256 4070cb29f19bffec…

MALICIOUS

PDF

49.5 KB Created: 2020-09-07 21:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 12693322d25064a1288655d67ea8d711 SHA-1: e31ea66e29b129c6bd9612f0e2106b729262afff SHA-256: 4070cb29f19bffec0a66528177fbea75cd0b21896390cc8661e67adf7805fd39
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wix?keyword=beholder+2+hile+apk In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/66078041102.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6993/1671/files/centralised_purchasing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0264/0030/files/27807586400.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/pafenajularurukogud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/76024494489.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5468/4565/files/47796134849.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3899/7669/files/11368019184.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/mumaligu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/piralujanid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5238/3902/files/cisco_ise_2._3_patch_3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/50988c_1b0240b3f4874ff7ab860729baba56ce.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d775a9_f197103fd26e46afb457f7ac064b17d0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cfbfd2_ce0d87b8135c489e9995d6ac2b019183.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/253000_532984a8c5724cf4aac604280cb1a9af.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7993/3862/files/pogelotezowab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8180/9563/files/chopin_sheet_music_prelude.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000996d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x996D 19544 bytes
SHA-256: 4144711d5aae1aac90115d9e7ff30d501a2193b0e9900319bdd2968a2e5119d4
font_00_sfnt_off000061ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BA 5116 bytes
SHA-256: c039ad3a36e7390e9e0912bfbb71164e891c3a257eb3e91cd9d60027a9cae0f2
font_01_sfnt_off00007314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7314 11972 bytes
SHA-256: c4289fa86738ffdba03c543c1bd46f7ef5b4908c7ce9aa83245b926f67fd455c

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