Malicious PDF — malware analysis report

Static analysis result for SHA-256 8387383300adc4f9…

MALICIOUS

PDF

43.4 KB Created: 2020-08-08 01:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 578536c7345fa96f27defab03689c47a SHA-1: a1ba0bafcc6e84b63dc6198bbf069a4d2b8e3296 SHA-256: 8387383300adc4f91247a408a5317e2f066c9317f736df3d4954949596f9b72a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on Shopify and appear to be part of a link farm. One prominent link redirects to `https://ttraff.cc/pify?keyword=javascript+ajax+book+pdf`, which is flagged as malicious redirector infrastructure. The document body also contains text related to JavaScript and AJAX, suggesting a lure to entice users to click on the malicious link. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=javascript+ajax+book+pdf
    • http://files.wanderingmusicians.com/uploads/1/3/2/7/132712185/2415693.pdf
    • http://files.sevoparis.fr/uploads/1/3/2/3/132302951/poveru-pituzapid-wixulasegota-toromareliz.pdf
    • http://files.janessaannetolman.com/uploads/1/3/0/7/130740563/sapoxenedupovu.pdf
    • http://files.hurley4hoosiers.com/uploads/1/3/0/8/130813357/7825376.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5580/7654/files/36527551016.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdf
    • https://cdn.shopify.com/s/files/1/0435/0246/9285/files/mojiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nadogenomaxijedunebenez.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/31027008828.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/zefuzi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/how_to_bootable_pendrive_in_cmd.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/12212821021.pdf
    • https://cdn.shopify.com/s/files/1/0433/5003/2549/files/kudamiweviribosedubi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7493/files/mujumelujiworeli.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/livre_bilingue_anglais_franais_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9636/7511/files/75473638509.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/
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/fil
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a74.bin
99daa91604b0b01861b3039df0faf88f953b96bdbba9a45e783d2e8fadc2b375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A74 5516 bytes
font_01_sfnt_off00007d56.bin
d8120518edcb43fe5a3eb306d2c96fe117fe0a3682972cd3ce9994ba2a46c305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D56 10480 bytes

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