Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b145832d0ea669e…

MALICIOUS

PDF

58.2 KB Created: 2020-08-30 11:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0293e78721163f24a340f5c2bc91c7d SHA-1: 5648b28344728cc525c2f4ce082e2a012993e9ec SHA-256: 9b145832d0ea669e493db8608aef3a4d956a6c1dcc388d66471803929bec4fca
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document also exhibits characteristics of a link farm, with numerous external PDF links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.ru/wix?keyword=java+ee+7+oracle+tutorial+pdf', is the primary indicator of malicious intent, likely serving as a lure for further malicious activity.

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=java+ee+7+oracle+tutorial+pdf
    • https://cdn.shopify.com/s/files/1/0444/7302/4679/files/low_back_strengthening_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/union_city_last_stand_hacked.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/jamazo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3749/7243/files/android_one_lock_screen_wallpaper.pdf
    • https://static.usrfiles.com/ugd/4dd980_84122e4d442d430cafeac9b2f64e3d43.pdf
    • https://static.usrfiles.com/ugd/98e298_c640e1a3eb82474785ba9e12574761dc.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5547/files/college_student_email_signature_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/jebugavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7288/8742/files/arduino_uno_pcb_layout.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3313/files/oecd_guidelines_dempe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6146/9596/files/rudulukupugasuwagofu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/sajidufidaretavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4046/4281/files/understanding_basel_iii.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2667/files/31666069097.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/jokuvajaxivusejef.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f03.bin
7ea0a80f9b948f8c021dba5ca64ce7de58a2a44c854350289d8a353dd119e0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F03 5100 bytes
font_01_sfnt_off0000b080.bin
b2016cab0a09456aaaa18e415b4c88133831a389ed268578553e50b4e5b40a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 12908 bytes

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