Malicious PDF — malware analysis report

Static analysis result for SHA-256 447e5193c4efa52c…

MALICIOUS

PDF

41.9 KB Created: 2020-09-01 11:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0deea743eb89e606592b9f1acd937754 SHA-1: 695ce1ce2f36795a1a8980374e9bbf63bb41b3aa SHA-256: 447e5193c4efa52c8e5b88fe7542e52030b4514f1c20dc1d0850b1fb3c7ae15c
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify, but one critical link redirects to a known malicious infrastructure. The document body, though heavily obfuscated, contains the text 'Flower shop design guide' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=flower+shop+design+guide
    • https://cdn.shopify.com/s/files/1/0435/4578/8584/files/belajar_bahasa_arab.pdf
    • https://cdn.shopify.com/s/files/1/0433/3617/1688/files/shik_shak_shok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3925/files/bacteria_cell_wall_structure.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8165/files/aptoide_apk_5._1._2_free_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4533/files/14226983739.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/null_character_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1254/files/managerial_accounting_garrison_14th_edition_solutions.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1688ae0d4854c749b564f0fb6d15fe0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7639605d2e23480d8678cb82f7e0aed6.pdf
    • https://static.usrfiles.com/ugd/e73fea_4679ac2eba8b4fd385a6be8b973ce0b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_337eaea437404630ab88b982952dc62e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b07cb329512d4054949d76341b293a75.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugomedimugatusigoxafif.pdf
    • https://cdn.shopify.com/s/files/1/0431/2147/5738/files/muzegar.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/starfinder_pact_worlds_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0434/1353/6925/files/gitowiseluwumusefovib.pdf
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/45515736083.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_off000064fb.bin
097b05ccc0f32da8cec8e6dffc1b66fc7ac2e6f0b36705b9f4e1ad2c46ad3171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FB 5060 bytes
font_01_sfnt_off00007642.bin
33d163bcd6b146caad0ae4077174d35e15461a292c15d0147101b92c25ec8edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7642 10640 bytes

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