Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad55f2819bc1ec8…

MALICIOUS

PDF

44.5 KB Created: 2020-08-10 11:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a0549fff264419a546949afb0280fed SHA-1: 032384934214e3280d060ed3f255b7702a7093c6 SHA-256: 3ad55f2819bc1ec804051f3e36839a565d5ebe8621ad875a053e3ca5a6b19a66
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm behavior, embedding numerous links to external PDFs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of outbound links and the presence of a known malicious redirector suggest a campaign focused on driving traffic to potentially harmful content or for SEO manipulation.

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=aprendizaje+significativo+critico+pdf
    • http://files.ennismustangmusic.org/uploads/1/3/2/6/132695746/5613683.pdf
    • http://files.wmbands.org/uploads/1/3/1/6/131606331/5553210.pdf
    • http://files.ericbramlett.org/uploads/1/3/1/3/131379719/21a74592.pdf
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/99901176693.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3901/files/vigirupe.pdf
    • https://cdn.shopify.com/s/files/1/0437/3266/4481/files/xusubefeloxigaloloxanewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/pdf_to_dxf_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/14238454407.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2102/files/lenaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zabaravoxetifup.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2917/files/new_grad_rn_resume_with_no_experience.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/76612423567.pdf
    • https://cdn.shopify.com/s/files/1/0436/1289/7437/files/single_variable_calculus_early_transcendentals_8th_edition_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xibirinadinabamagumib.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/funny_discord_gifs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cd2.bin
2255d788c273fcfa64c2e8f2eb1a9ce70fdc212096caa253f27bad3fb54a40e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD2 5464 bytes
font_01_sfnt_off00007f95.bin
f81f54a8e82ed9307a532038e9d95b5f1c8cd24a363febf3c9a57ec4645af2bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F95 11068 bytes