Malicious PDF — malware analysis report

Static analysis result for SHA-256 5471989a5203cf1b…

MALICIOUS

PDF

43.2 KB Created: 2020-08-20 08:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbf728e6e2692f99ab903774ad83bfb9 SHA-1: 86c5a68d8b3dc93f33394cca7b403a7f19fb6057 SHA-256: 5471989a5203cf1beb3f315d105ff85517e2aee6c49760a4fb07463534ab6d26
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=bento+box+recipes+pdf'. This link is presented within the document body, disguised as a recipe PDF, to entice users to click. The PDF also contains a large number of external PDF links, many hosted on shopify.com, suggesting a link farm or SEO manipulation tactic. The ML classifier 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.cc/pify?keyword=bento+box+recipes+pdf
    • http://kutudu.lucysugerman.com/uploads/1/3/2/8/132814930/wivevufa_bomifiwix.pdf
    • http://semefani.mitchheaslipfitness.com/uploads/1/3/1/8/131856919/winudipamerodideg.pdf
    • http://files.mounttaborbaseball.com/uploads/1/3/0/8/130813982/9700333.pdf
    • https://cdn.shopify.com/s/files/1/0433/9872/5793/files/91743402879.pdf
    • https://cdn.shopify.com/s/files/1/0429/0831/9907/files/38291103069.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/59380183810.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/sulolimubazomenew.pdf
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/fenemukaveru.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9880/files/pepodomuxakulonidukonik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nezaneseku.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/jakegekoni.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/algebra_1_review_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/tijutujemomofifuberuregiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0704/files/gituxesodetidativ.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9966/files/german_synonyms_dictionary.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_off00006c26.bin
5a1e281fad5574c8d2000f44e24feed518738394394733870f95bc0b702fcbfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C26 5164 bytes
font_01_sfnt_off00007dc8.bin
55de7211e5ff298cd04e61b175b0bcee22ba4aab38ec7923a67e35ad7dd71c70
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC8 10224 bytes