Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f13e8c3c1c1cdb…

MALICIOUS

PDF

49.4 KB Created: 2020-08-12 20:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9c2176951abf3f11c5b5852871f9b2c SHA-1: 7eee07e741f7c886bdac5d14968350e76309b855 SHA-256: 79f13e8c3c1c1cdbb469d4d44f5381185ab02bcb79f054da38a2a35336695a65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to external PDFs, suggesting an SEO poisoning or link farm tactic to drive traffic to malicious infrastructure. The primary URL, https://ttraff.com/pify?keyword=simplifying+algebraic+fractions+worksheet+pdf+kuta, is identified as a malicious redirector. The document body, though partially corrupted, contains text related to algebraic fractions and worksheet generation, reinforcing the lure.

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=simplifying+algebraic+fractions+worksheet+pdf+kuta
    • http://fuvefugi.handsbyhairitage.co/uploads/1/3/0/7/130775732/4411500.pdf
    • http://files.envirolawteachers.com/uploads/1/3/0/7/130775528/3ba7ca2.pdf
    • http://files.affinity-artwork.com/uploads/1/3/1/6/131636891/bobawidoxe_kowatex_rofokarujakavez.pdf
    • http://xelamukun.bradenriverhsmediacenter.com/uploads/1/3/1/4/131406717/vejok-wilori.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8884/6753/files/mobopavuride.pdf
    • https://cdn.shopify.com/s/files/1/0447/9343/0177/files/la_ballata_dell_amore_cieco_spartito.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1248/files/962189324.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/wow_the_oracles.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8053/files/kafodedugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8771/5742/files/18406886395.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/8832057101.pdf
    • https://cdn.shopify.com/s/files/1/0437/4052/8792/files/fixifajajutaresabebune.pdf
    • https://cdn.shopify.com/s/files/1/0429/9227/1519/files/jefexinu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/83401475289.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_off0000808f.bin
6a5bc5b2397a6965f032e6569521d00d3be14e8f40fd14632e7934c4db67fef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x808F 6068 bytes
font_01_sfnt_off00009516.bin
9cb5da9dfb9dcc6793aa7c8483ee9ac384713d012af8ba89c3e4e6bc40c1887e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9516 10508 bytes