Malicious PDF — malware analysis report

Static analysis result for SHA-256 0489633cdceee651…

MALICIOUS

PDF

43.3 KB Created: 2020-08-17 09:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a22b8a181162db95a7edd3ea28a77c5 SHA-1: f0a9f8cd03e99a856d2c83b73ecaef2c730f86e7 SHA-256: 0489633cdceee65195be379c69197fd6e498ee64763369afa24429f627f09bae
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=windows+10+iso+bootable+usb`. This URL is presented within the document body, disguised as a download for a Windows 10 bootable USB. The PDF also exhibits characteristics of a link farm, with numerous external links, many of which are benign Shopify links, but the primary redirector is malicious. The ML classifier strongly flags this PDF as malicious.

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.ru/pify?keyword=windows+10+iso+bootable+usb
    • http://files.acuteanglewritez.com/uploads/1/3/2/6/132681409/buvedisele_xaputejaki_mafafitata.pdf
    • http://files.xiphospress.com/uploads/1/3/0/8/130814466/fuvag-jolumosufobib-sobibijaretuvi-wegugunujati.pdf
    • http://files.wvbcschool.org/uploads/1/3/1/0/131069789/lujeji.pdf
    • http://tigifeniz.whiteoakbenddairygoats.com/uploads/1/3/0/8/130874284/wubugafumiwejubelebu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8683/1004/files/parking_building_floor_plan.pdf
    • https://cdn.shopify.com/s/files/1/0435/2091/7668/files/brachial_plexus_injury.pdf
    • https://cdn.shopify.com/s/files/1/0428/3629/5836/files/xuzidunudojiguzazeboped.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/dulorukibemadaraw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/54660423108.pdf
    • https://cdn.shopify.com/s/files/1/0434/7225/7181/files/mexican_date_format.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/plural_of_cyclops.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/75458591512.pdf
    • https://cdn.shopify.com/s/files/1/0435/9582/5320/files/examen_regional_francais_la_boite_a_merveille_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/revefurarovulerebafuj.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c00.bin
6c4d1a030686755c6a38118f08319fe95f6fd0b8ab2b93a2ee2c7453f53c0336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C00 5164 bytes
font_01_sfnt_off00007dbb.bin
11caf587baf941320281a60abb253ad9ec0110944f6cf3cdc96cb88af1a1b0f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBB 10120 bytes

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