Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef12f89b3906c641…

MALICIOUS

PDF

65.7 KB Created: 2020-09-22 09:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d186729f73dc386d27ef6eda490318f1 SHA-1: fa678414f8e950ee847c309c2fc58ccf5941630f SHA-256: ef12f89b3906c641796f8747b7600fd1674dddd21a0d9ccca1cd27167db2662a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The document body, though partially corrupted, includes text suggesting it is a manual, which is a common lure for phishing or malware delivery. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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=chromeleon+manual+7.2
    • http://files.kellermarkethouse.org/uploads/1/3/0/9/130969465/9872649.pdf
    • http://files.faithwc.com/uploads/1/3/1/6/131607600/5621221.pdf
    • http://files.raventsd.com/uploads/1/3/1/0/131070216/2820367.pdf
    • http://zibujen.lakeodessaarts.com/uploads/1/3/1/4/131454215/tosivepekivo.pdf
    • http://rolegeweb.soilandforestryservices.com/uploads/1/3/1/4/131454057/nisalapobeput_pesafavujek.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/75358094129.pdf
    • https://cdn.shopify.com/s/files/1/0434/7743/4525/files/45288066837.pdf
    • https://cdn.shopify.com/s/files/1/0436/1938/5502/files/carry_on_maratha_song.pdf
    • https://91cbb623-3b11-402c-b1d2-a40744e1d2fd.filesusr.com/ugd/9c0842_9413dff28e6f44d88fd028a0897705b0.pdf?index=true
    • https://fdf3af0b-fecd-4183-baf5-e3cddb67b9b1.filesusr.com/ugd/111c46_c4eff056df154fcf8fc09bfa508820f2.pdf?index=true
    • https://78f58e4d-aa05-4ea5-812c-91a6b8612ac5.filesusr.com/ugd/9edd50_b52b940f1fd24fa98facd9bfa82e2f8a.pdf?index=true
    • https://30d2d55e-e3de-4b99-8101-9feaa5a11f35.filesusr.com/ugd/3283b0_5c0f21988966433faa8c3a5f49bb989c.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/google_design_sprint_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/niwireniwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/pajopazuzinurozer.pdf
    • https://cdn.shopify.com/s/files/1/0436/1935/2739/files/histria_bblica_infantil_sobre_obedincia.pdf
    • https://cdn.shopify.com/s/files/1/0484/4083/6250/files/ernies_crab_house_bladensburg_road.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b455.bin
8972d89b3a813693b3b86d9a813f62db52c5fd9721e35b0ba2edb855791d8983		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 4768 bytes
font_01_sfnt_off0000c45e.bin
4210feb0bbc1149294fe8fb78fd18792cdfe76206bfb90fceda8a9e7c9a1f643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC45E 11512 bytes
font_02_sfnt_off0000eb51.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 4324 bytes

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