Malicious PDF — malware analysis report

Static analysis result for SHA-256 00468c1db6d08031…

MALICIOUS

PDF

49.3 KB Created: 2020-08-29 22:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b87fcd94166abe2d7a1b18d896c71b74 SHA-1: f46a4633c98d954539eee0e723e5b6eab68e9807 SHA-256: 00468c1db6d080315cbc17c27d04cc037a4896446ebff181f628031c6c3cb52d
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by the presence of a large number of embedded URLs, many of which are likely part of a link farm. The document body, though heavily obfuscated, contains the suspicious URL and appears to be a lure for downloading a file. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=distributed+database+principles+and+systems+stefano+ceri+pdf+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/6058/4870/files/application_letter_for_sales_representative_without_experience.pdf
    • https://cdn.shopify.com/s/files/1/0431/5932/2778/files/jupefiwa.pdf
    • https://cdn.shopify.com/s/files/1/0452/5208/3869/files/31139614271.pdf
    • https://static.usrfiles.com/ugd/b8c837_b89b70d13faa442ebdba2253dfcfa388.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8010d0e50c94d93b985fc036080c50c.pdf
    • https://static.usrfiles.com/ugd/b8c837_84efde7250314dec8f068c642ff89482.pdf
    • https://static.usrfiles.com/ugd/b8c837_23fd4484a92a4616b0e93462d91a9c37.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_4126399a73d5460a98bfd61c72c3573f.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2207/files/92844162769.pdf
    • https://cdn.shopify.com/s/files/1/0445/3600/4767/files/88340797034.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/5072114046.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/rinutujejabenixaretog.pdf
    • https://cdn.shopify.com/s/files/1/0457/3619/8300/files/color_by_number_math_worksheets_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0429/2168/9254/files/91376147911.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00008de9.bin
f0592fbecee11e228a88438a0495e4ef320e2a3b8eca2523dd9088a748054007		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8DE9 17788 bytes
font_00_sfnt_off000049b1.bin
153a9c753eb90644602c1aad1c90b767bb20f2f1ca42a009964a493fdd2ac214		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49B1 5516 bytes
font_01_sfnt_off00005c5d.bin
a8c04eff2cf8acb71a289481127def372a97a710d7458df5e90e833f2d33c911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5D 4796 bytes
font_02_sfnt_off00006bb6.bin
373a0eb94d9c738bee86717865bc8122d012e5ed42812a6a7c7ba4473b1fa42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB6 9920 bytes
font_04_sfnt_off0000a89f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA89F 4324 bytes

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