Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4348e504f8b9445…

MALICIOUS

PDF

39.9 KB Created: 2020-07-19 22:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fd0b31e479084b3cb66327153ab23e8 SHA-1: 28122e3d9103d57948f624442285c3eec71e79b7 SHA-256: d4348e504f8b9445250b6e7cca3b1000aaaa6adae59a0b3b890307c965f52c9c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to joining a Skype meeting, suggesting a social engineering lure. The presence of numerous external PDF links, many pointing to WordPress, indicates a link farm used for SEO poisoning or distributing malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=join+meeting+skype+for+business+android
    • http://files.fluxplay.co.uk/uploads/1/3/1/4/131438449/vufufekiwod.pdf
    • http://files.bettervoicescoach.com/uploads/1/3/1/3/131380083/junipodibas.pdf
    • http://files.sandriver.org/uploads/1/3/0/9/130969012/8577981.pdf
    • http://files.babygotbackbrace.com/uploads/1/3/0/7/130739239/13250.pdf
    • http://files.massageinnelson.com/uploads/1/3/0/8/130813988/1636862.pdf
    • http://files.massageinnelson.com/uploa
    • https://pulanaradi.files.wordpress.com/2020/07/99225492675.pdf
    • https://tigirev.files.wordpress.com/2020/07/45430202124.pdf
    • https://pajifofa.files.wordpress.com/2020/07/gutefiwavuboxun.pdf
    • https://rodobab757524627.files.wordpress.com/2020/07/61686044442.pdf
    • https://mosijuf.files.wordpress.com/2020/06/98019959225.pdf
    • https://voluvatoru.files.wordpress.com/2020/06/86484532607.pdf
    • https://ramisiwew.files.wordpress.com/2020/06/71442828225.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/fizomemogezududo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/49229094902.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65925238695.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/nojufaloxukarike.pdf
    • https://cdn.shopify.com/s/files/1/0435/0722/0644/files/wasegabiwojozobojegu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7331/files/34048864207.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94393320092.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/mofajiriluxine.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_off00005dc1.bin
65d246a2e3ccd7098b28555bb93c16608be3431fc1e106a0141d90448763ca4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC1 5508 bytes
font_01_sfnt_off00007064.bin
91bebc825badfacf707c7b2ec9c536d329cdb77e7b0c3372598ce30574446c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7064 9812 bytes

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