Malicious PDF — malware analysis report

Static analysis result for SHA-256 021e3ca7f9b76a69…

MALICIOUS

PDF

32.5 KB Created: 2020-08-29 04:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59a43db2362dd6dd9f12cbc3160cf4bb SHA-1: f5361590a7406d7edf7101d72b8ba84a5522740a SHA-256: 021e3ca7f9b76a69c15884b201272609d544842f4ee35a03c9fca7d045eb9048
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which, https://ttraff.com/wix?keyword=abstract+nouns+worksheet+for+grade+6, is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to an educational worksheet, suggesting a lure to disguise the malicious intent. The presence of numerous other PDF links, many pointing to benign content, indicates a potential SEO link farm strategy to obscure the malicious URL.

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/wix?keyword=abstract+nouns+worksheet+for+grade+6
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8810646556304b8db3d75e64039a340e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8388d73db444d69a14b93bc18b36f80.pdf
    • https://static.usrfiles.com/ugd/b8c837_43940db074194fada2b71d292d73fb8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4503845d5b84f0ca63de83f4af63989.pdf
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/lajefu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4291/2926/files/springing_daca_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/59087695884.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kijajakunij.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/45257788655.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9029/files/vekopatotu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/hp_6700_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/nonuninuvisededipibu.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_off0000416d.bin
7e645d5ea62daf59b599eb3ac49f314e24e825891e8a4f0d388abb4b6400a963
pdf-font-stream PDF embedded font (sfnt) at offset 0x416D 5692 bytes
font_01_sfnt_off000054d1.bin
29604d0826107aace4c323da8107f4f637a3e94a49c1801f69b9075a629f6cea
pdf-font-stream PDF embedded font (sfnt) at offset 0x54D1 9540 bytes