Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af056d58dd8c9c2…

MALICIOUS

PDF

47.3 KB Created: 2020-09-05 00:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 206deb3d735de9408c7ded58ec07e146 SHA-1: 57a734a6a572ddb631345b709502fd9ae421dc3d SHA-256: 8af056d58dd8c9c27bf0a90a3a33453c0a92bdab1cebea4a76e890673063f0cf
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure related to 'free certificates'. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, many pointing to Shopify, likely to improve search engine ranking for malicious content. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

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.link/wix?keyword=azo+free+certificate+pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8487/files/20528088506.pdf
    • https://cdn.shopify.com/s/files/1/0437/3407/3505/files/android_mobile_apps_png.pdf
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/wasojufokuwuzosak.pdf
    • https://cdn.shopify.com/s/files/1/0437/0992/3481/files/77037079996.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/xilodimusipawilija.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4375/files/38522073678.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/epidemiologia_descriptiva_y_analitica.pdf
    • https://cdn.shopify.com/s/files/1/0439/3671/0824/files/numukalolago.pdf
    • https://cdn.shopify.com/s/files/1/0435/6197/5971/files/pdf_file_free_download_app.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/detogugoronaxarite.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4213/6476/files/functional_group_interconversion.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8182/files/wuniranimiregiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/natajiwexa.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_off0000753c.bin
2a91207b7bcafab92b2db533b73674c95fa5c1babdc7c73c9dd438561321ee9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 4976 bytes
font_01_sfnt_off00008645.bin
ab2f0f8d16e87ec0c57e757c2c4d6fa7d24b6ee85d9080cbc1ff7a7984a5b76d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8645 12956 bytes