Malicious PDF — malware analysis report

Static analysis result for SHA-256 8312a7e83a1eea29…

MALICIOUS

PDF

32.4 KB Created: 2020-08-15 18:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22e3ed87ea70fab52be5bab854709a8d SHA-1: 410023e73e9e4c95665c99a003e49b80388ab11d SHA-256: 8312a7e83a1eea2930338e571dd99ffd3fc78a46c4e327be52eb5aeca089ce19
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, contains text suggesting a lure related to a 'weather report' and includes the malicious redirector URL. This indicates an attempt to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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=anza+borrego+weather+report
    • http://zedurudo.learntarotcards.com/uploads/1/3/1/3/131383386/30b71c.pdf
    • http://files.schillingmediainc.com/uploads/1/3/0/7/130739061/0c20f76dda1.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/bawutes.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/shortie_like_mine_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/9864/3363/files/10553404826.pdf
    • https://cdn.shopify.com/s/files/1/0446/0108/2020/files/linked_list_data_structure_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0438/2857/6416/files/fixoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/80361317290.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/widozurexubu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0634/5895/files/rifibivusosasawe.pdf
    • https://cdn.shopify.com/s/files/1/0438/9086/8379/files/xajed.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_off000043e4.bin
3c42bc2862f3396dd97dfacd388f516c6d9eaa11aa852fdea73fcc49f69a7bde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43E4 5144 bytes
font_01_sfnt_off00005576.bin
488692e3722f3168488fbfbc5b7e00cc8aa8e29542330d53d69794d65324a4ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5576 9364 bytes

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