Malicious PDF — malware analysis report

Static analysis result for SHA-256 6637d5dbfcbcb776…

MALICIOUS

PDF

72.7 KB Created: 2020-09-01 23:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59895392b0251bc677c3cf9c3d374d0d SHA-1: 8e1d5b3020ce5de3898c172ff064d8f3be29de82 SHA-256: 6637d5dbfcbcb77626249495374094d053919ecc90cb6cc66ae10e1c0acfe003
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector service, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains a URL that appears to be a lure for immigration-related documents. The ML classifier strongly indicates maliciousness, and the presence of a redirector link confirms a malicious intent to lead the user to a potentially harmful site.

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.com/pify?keyword=format+for+experience+certificate+for+canada+immigration
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/510691_5a9ec7cd03cb46318676c22a8b152fa5.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_c13914c4a0594cafaf32e90b23e55f2d.pdf
    • https://static.usrfiles.com/ugd/61f964_8d73e25094bc40ec90c88566cc3af3e2.pdf
    • https://static.usrfiles.com/ugd/0a0016_b36d44ae239b4b23a91a90c4e8c8420e.pdf
    • https://cdn.shopify.com/s/files/1/0430/1750/2869/files/xasirekatogadipenu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/87939079574.pdf
    • https://cdn.shopify.com/s/files/1/0437/4174/1205/files/sivivururepolu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1777/8838/files/wedovoriziduwix.pdf
    • https://cdn.shopify.com/s/files/1/0429/9207/4905/files/54578527227.pdf
    • https://static.usrfiles.com/ugd/91e123_ec883426017b4beaba687e17803e152f.pdf
    • https://static.usrfiles.com/ugd/eb6612_161ec7de792a476e83e1b54a9ac7c695.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d653.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 2828 bytes
font_01_sfnt_off0000e04d.bin
b2a5875cf6c984543c7076fca45b7c3d9d935c067123a0fa56ec39550778f113
pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 5288 bytes
font_02_sfnt_off0000f240.bin
3c64c6ba6c1f63453725147fb92f79c3108cdd017e77d98173bdade20f0aee06
pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 10152 bytes