Malicious PDF — malware analysis report

Static analysis result for SHA-256 9256c8e860d5051a…

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 16:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b9149ce104d6ad7c15aacd53a9a0b0d3 SHA-1: 159750e477d10f7426695ed70927527f379af07b SHA-256: 9256c8e860d5051af23541b7f4dc9a27ebe6380c95779df7381f08df4c221c68
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though partially corrupted, contains text related to formatting and a URL that appears to be a lure. The presence of a malicious redirector link strongly suggests an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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.link/pify?keyword=format+bibliography+apa+online In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/88a84f_8125302b9cbb42c79547f803703e9f05.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_97127c41518d436d95f93a6150ba9786.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_293e9a8adda444519479fe0f31be8d2a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_32fe25f75ec94347bb927212096f365a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eb5a6a_368312a81247491b8c95233a9b0f4c0c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9cb927_18592679c24f4195b6c840adac037af5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cfbfd2_1a949175da0d4aefb18ee76dc4d20a99.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c8a981_035b88b466854d79aac18077970108bc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2d089fc0ad8e456caa0a9e5e7193cf6c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d6c97b325978480dbf153dd2a6de8c26.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9cfd0a_4d74a16cd4f3478d8b8f0fadfa36609e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2fd0a6254a624316afc839a0cfb07ffb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/susurokiredek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9171/2405/files/pokolugori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/kumuxubosedatakudigeva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/r_repeated_measures_anova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9380/1625/files/97244763411.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000635c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635C 5252 bytes
SHA-256: 94b1496ae0c2bd4ac33e00cb92890e143b23b7de5dafa7ee8a515c3c4f01ac7a
font_01_sfnt_off00007515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7515 9864 bytes
SHA-256: f2305a55bf80bd26558b90ed5ab456722a17b483376aeca1c339c8b7d4a507d4

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