Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e594a1fae9246de…

MALICIOUS

PDF

39.9 KB Created: 2020-08-30 20:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05285c1fcf7535ca07be1f6e0005ab0b SHA-1: 7ba6cd7d0a2e50c8291e309a3a31dd39a0c63592 SHA-256: 6e594a1fae9246de13c5aa62f03bb33230f5c0e19d78c41e4335306a30ea6c11
154 Risk Score

Malware Insights

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

The PDF contains numerous links disguised as educational content, specifically a 'Pythagorean theorem worksheet'. One of these links, 'https://ttraff.com/wix?keyword=pythagorean+theorem+worksheet+8th+grade', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm and redirector.

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=pythagorean+theorem+worksheet+8th+grade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2432/6566/files/votiw.pdf
    • https://cdn.shopify.com/s/files/1/0450/3427/4966/files/attaccamento_e_amore_grazia_attili.pdf
    • https://cdn.shopify.com/s/files/1/0438/0845/6865/files/fatebogixowazedexelipexa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/kawelisoxapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3820/3290/files/android_studio_google_play_app_signing.pdf
    • https://cdn.shopify.com/s/files/1/0437/7244/4823/files/27597356102.pdf
    • https://static.usrfiles.com/ugd/01e791_116605517ad04392aa7fa0154d629d7c.pdf
    • https://static.usrfiles.com/ugd/e745be_a526d1a908e64a29aba437ccdc963aab.pdf
    • https://static.usrfiles.com/ugd/ae15ca_e126f3070c23441fbb13a1e3901f611b.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/tukixiwew.pdf
    • https://cdn.shopify.com/s/files/1/0459/2553/1815/files/lugomiligimivazadifa.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_off00005e8d.bin
f9ceddcea731eff198525c7e21d383446578909adc609c218b008886bff37293
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8D 5660 bytes
font_01_sfnt_off000071b3.bin
664f12219a922813e1c1d4df416b2f6674a5ab21d74e86c02f1fdd9d5dc33f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x71B3 9768 bytes