Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa4aaf64efd15ec…

MALICIOUS

PDF

44.8 KB Created: 2020-08-12 06:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b27f79e418e06ac9dfe5144516d274d SHA-1: 497acf317e56a105daf637d884b3a7bc3808d518 SHA-256: 6aa4aaf64efd15ec082d3a66a743e62b366455493602ae03a9c91984c106151a
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 pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.ru/wb?keyword=chevy%20cruze%20diesel%20manual%20review', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure under the guise of providing a manual review. No scripts were extracted, but the extensive link farm and malicious redirector are strong indicators of a phishing or scam campaign.

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/wb?keyword=chevy%20cruze%20diesel%20manual%20review
    • http://files.lawrenceartandframe.com/uploads/1/3/1/4/131454316/pezasuki_filuvu_riwize.pdf
    • http://files.trishhermanson.com/uploads/1/3/0/9/130969656/ce04523d60f.pdf
    • http://files.asianwildcattle.org/uploads/1/3/0/8/130873918/6c12f404b85c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/77721321764.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/77598129579.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/kurerotadasese.pdf
    • https://cdn.shopify.com/s/files/1/0435/9992/1315/files/75158203953.pdf
    • https://cdn.shopify.com/s/files/1/0431/5113/0785/files/zagumama.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/garul.pdf
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/90283669093.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2484/files/giwejamumivosafedus.pdf
    • https://cdn.shopify.com/s/files/1/0436/7617/2441/files/broadening_of_spectral_lines.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/akuntansi_biaya_overhead_pabrik.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/vivujulu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6609/6802/files/irs_form_6251instructions.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_off0000633b.bin
a53f92babff976820423b8acbbb51bb3269e0bd447afe7cd30e1f1b08a02b10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x633B 5196 bytes
font_01_sfnt_off000074d2.bin
550e57d72d50d0637d7b3bfeb2365d132d589482252ba064ab6af882044ca741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D2 10352 bytes
font_02_sfnt_off00009838.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9838 4324 bytes

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