Malicious PDF — malware analysis report

Static analysis result for SHA-256 0213a1981d41898a…

MALICIOUS

PDF

44.7 KB Created: 2020-08-30 10:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7621c47bc258c6e7004894eb9d2399d1 SHA-1: b29ef58b05c416bb55d31993e5775868c123989a SHA-256: 0213a1981d41898a5ca0fd719ad6a353e2067e7935dbaf7a1ed40cc6c53279a9
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 link farm designed to manipulate search engine results. One prominent URL, https://ttraff.me/wix?keyword=ielts+essay+topic+with+answers, is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or scam attempt disguised as educational 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.me/wix?keyword=ielts+essay+topic+with+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d0e3da1410c94639a9f54b64a8f685c5.pdf
    • https://static.usrfiles.com/ugd/affb4a_7c683fe5d5d847cfb5b51f9d09bc3bdb.pdf
    • https://static.usrfiles.com/ugd/599026_ef9e34fc7663402eba5282fcad2f60af.pdf
    • https://static.usrfiles.com/ugd/b8c837_59fa1813d14a48b384a6d51b8831d1e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_35abd24c862d4319b7e29aed266c0f7d.pdf
    • https://cdn.shopify.com/s/files/1/0432/1837/0728/files/last_stand_union_city.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/converting_between_metric_units_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/xalodevowufafunarad.pdf
    • https://cdn.shopify.com/s/files/1/0437/3338/5381/files/the_binomial_theorem_worksheet_with_work.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3077/files/tadezuwagigijalizasofetap.pdf
    • https://static.usrfiles.com/ugd/097bd5_ca601c1d565342a5a984a84e688b58fa.pdf
    • https://static.usrfiles.com/ugd/3bca44_aae0811d43294e08b33bcf6191a9212a.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/97857911252.pdf
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/40442049096.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.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_off000067a7.bin
f48442293c64d04e0aa631e839080a17656bc0c7cc21db25a9bc5bc305eceae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A7 5152 bytes
font_01_sfnt_off0000792c.bin
3f019984cfdfe6c84274c7669782eb41d5b5f4473003a8ae79e5f286dfbd04e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792C 2252 bytes
font_02_sfnt_off0000836c.bin
37c15236d0ce036ca8660c33c18f2b138ee498e83691a19cf58bacda9be3f05d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836C 10008 bytes

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