Malicious PDF — malware analysis report

Static analysis result for SHA-256 019b5f3996051281…

MALICIOUS

PDF

34.7 KB Created: 2020-08-30 21:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd670a2d64dc68e661f1665ab2a6995b SHA-1: 77164b9ed2926f5dcf5e26b44f84d066664903c4 SHA-256: 019b5f3996051281bd4017befabe0ac999762c470318a94da22717e6d21ee5fa
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This indicates a clear intent to lure users to malicious sites, likely for further exploitation or credential harvesting.

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/wix?keyword=gifts+of+the+holy+spirit+worksheet+a
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/73cb9e_98b04f0c82ce472abf1318eeea6cfaad.pdf
    • https://static.usrfiles.com/ugd/51c472_26cd1cf3a11a4a54802c30971f4f22c6.pdf
    • https://static.usrfiles.com/ugd/9e53d4_a04d5a0749194fb9a6c87c9c3e5e1682.pdf
    • https://static.usrfiles.com/ugd/735189_260fd049eabb46f3af0169014d41e5f2.pdf
    • https://cdn.shopify.com/s/files/1/0431/7288/8742/files/dompdf_page_break_in_php.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/41615136219.pdf
    • https://cdn.shopify.com/s/files/1/0438/4073/3341/files/shrek_party_game.pdf
    • https://cdn.shopify.com/s/files/1/0437/1624/7703/files/vosukutixakeg.pdf
    • https://static.usrfiles.com/ugd/7f929b_aed7610edd7546e8b0346b758d5eb229.pdf
    • https://static.usrfiles.com/ugd/93c935_12d6c9270d6b4b048510b2dc9aa9b220.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/bigorunali.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2394/files/reganeripinenuso.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/54793403178.pdf
    • https://cdn.shopify.com/s/files/1/0434/8916/5478/files/amazing_grace_violin.pdf
    • https://cdn.shopify.com/s/files/1/0437/3289/3857/files/puerperal_pyrexia.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_off00004b40.bin
3d105837de228481a78063f7141569ee68f9a8e6c20ac2ba4a7c6731785482ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B40 5280 bytes
font_01_sfnt_off00005d48.bin
26214a797c4be4edba114a5506fe091a1217a21b545dcbb972495b0a00bca528
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D48 9608 bytes