Malicious PDF — malware analysis report

Static analysis result for SHA-256 8647c2c97482ca59…

MALICIOUS

PDF

40.2 KB Created: 2020-08-30 19:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c544dbb6c84db53d71e9bae75f9656e7 SHA-1: 7c992658f2456f66429648b2869f955900097614 SHA-256: 8647c2c97482ca596babad2afeb34898e08978532e52e3a00503de59bedd68fb
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (ttraff.cc). The document body, though heavily obfuscated, also contains this URL. The presence of a large number of external links, many hosted on cdn.shopify.com, suggests a link farm or redirection strategy to distribute malicious content.

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=multiplication+chart+30+x+30
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/tratamento_cancer_de_pulmo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/pivimu.pdf
    • https://cdn.shopify.com/s/files/1/0457/0044/8412/files/67754101615.pdf
    • https://cdn.shopify.com/s/files/1/0434/4043/9446/files/33786005611.pdf
    • https://cdn.shopify.com/s/files/1/0433/4934/4421/files/moxakimulidoredixoveb.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7952/files/30724117016.pdf
    • https://cdn.shopify.com/s/files/1/0435/7967/0689/files/raposarazomelekanudefeve.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e23a41186604fdda221f1467e8a191e.pdf
    • https://static.usrfiles.com/ugd/aef5b7_3191ce1466e64e06b480aca90db34cb9.pdf
    • https://static.usrfiles.com/ugd/72216b_2474c98668e748f0b912240531fdce41.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a102dd05cd640c09c166b36a8101432.pdf
    • https://static.usrfiles.com/ugd/1be480_3ab4433f0b5540cdb3204baf327088fd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053e8.bin
8f6d25d74fc09bc1ae2f6dd1051fddeceb95109022a8d6307525abbcd973cd2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x53E8 4984 bytes
font_01_sfnt_off000064cb.bin
d87c4ae5469aaa378486555714960003fe15841f228bc0ce496f5160e7027a3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x64CB 9804 bytes
font_02_sfnt_off00008657.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x8657 4324 bytes