Malicious PDF — malware analysis report

Static analysis result for SHA-256 195992a5ac89db55…

MALICIOUS

PDF

42.7 KB Created: 2020-08-06 11:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 771d1557beee8a4505c7e46cbdeaaad4 SHA-1: c9193820e0c347f3295a1fbb0e0ca99262438be2 SHA-256: 195992a5ac89db55e3a025d4d39aaf9105bda2e746402d5f5990d1f69c51750a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a link farm and a redirector to malicious infrastructure, disguised as a "Basics of windows 10 pdf". The SE_CLICKFIX heuristic indicates the document likely instructs the user to execute a command, a common social engineering tactic to bypass security controls. The ML classifier strongly flags this PDF as malicious, and the presence of embedded URLs suggests an attempt to lead the user to a compromised site or download further malicious content.

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=basics+of+windows+10+pdf
    • http://files.empirepanj.com/uploads/1/3/1/3/131398093/niwamagewegar.pdf
    • http://files.rebuildingself.com/uploads/1/3/0/8/130874359/wenisububobiv_fewinutujo_nolozale.pdf
    • http://files.greater-faith.org/uploads/1/3/1/6/131637055/felotoreme_sotixak.pdf
    • http://files.rareapparel.co/uploads/1/3/1/3/131381679/3072934.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7004/5864/files/34821421128.pdf
    • https://cdn.shopify.com/s/files/1/0437/8705/9362/files/39450222243.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9324/files/alone_together_real_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/resemeberurorejos.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/toxoladosewuku.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/73136800829.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/91818119347.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/batilubifox.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3802/files/cd4017_aplicaciones.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/5806380029.pdf
    • https://cdn.shopify.com/s/files/1/0450/8614/6712/files/glute_building_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/soraleboxaxuruz.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_off0000697b.bin
0e8f10c2c9e920337f56b0f42a339695bfbf81df09a411c20f7d951d734f95e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697B 5356 bytes
font_01_sfnt_off00007be4.bin
473c39bbea06b6c23c389d4eb9c9e29611b0805ebc8f54d489ce7865d2459292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE4 10124 bytes

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