Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1aa9bea7b1a1375…

MALICIOUS

PDF

51.6 KB Created: 2020-08-15 01:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bea894c1ff1e0977636fbb2cae4a5b8 SHA-1: 6bae4c86cd7558e6b562a565dbc0c939e64bb634 SHA-256: b1aa9bea7b1a1375474576a9691dc284bbeda080eef88f41729dcc4ef79fdddb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=britax+b+safe+35+car+seat+manual'. This URL is likely used to redirect users to a malicious site. The document body, though partially corrupted, also contains this URL and references to other PDFs hosted on Shopify, suggesting a link farm or redirection tactic. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=britax+b+safe+35+car+seat+manual
    • http://files.folkmusic.com/uploads/1/3/1/4/131407530/4506008.pdf
    • http://xoxaje.100youthwhocarecentralyorkregion.com/uploads/1/3/0/7/130739564/8938907.pdf
    • http://files.greatalleghenypassagecompanion.com/uploads/1/3/1/3/131379296/2f4544b322.pdf
    • http://murovezik.leoralutz.com/uploads/1/3/1/0/131070867/tunewofaxasuxugag.pdf
    • http://files.northeastchristiancollege.com/uploads/1/3/2/7/132740614/120fbd6bef8dfe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/wetikuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/48420330121.pdf
    • https://cdn.shopify.com/s/files/1/0431/4982/0065/files/66762496868.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2507/files/dosasufikozapubaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/xilezarow.pdf
    • https://cdn.shopify.com/s/files/1/0431/0535/3885/files/561750028.pdf
    • https://cdn.shopify.com/s/files/1/0432/6958/7104/files/libro_expedicion_botanica.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riginijulu.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067fe.bin
3696cf0d0b73f44702647033740232c02c967120817106ffd6c2ca3097bbd36e
pdf-font-stream PDF embedded font (sfnt) at offset 0x67FE 5572 bytes
font_01_sfnt_off00007ad0.bin
625debe93c1abadd28636ea837ca78b61d69f4c31ec7fe8f7b0cb5ce63da5ac5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD0 9204 bytes
font_02_sfnt_off000094ce.bin
2771bc334ca62348ebec30462350a553c6bdccb1c994ea2c7fee5930ae8be00c
pdf-font-stream PDF embedded font (sfnt) at offset 0x94CE 14284 bytes