Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0cc7472df2399d…

MALICIOUS

PDF

44.4 KB Created: 2020-08-19 10:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e9db71a66fd5163c10f587407f4922f SHA-1: 66e26aa64d7507ae225f3c4f3254b9fae71252ef SHA-256: 7c0cc7472df2399d3b311d279d61714020ad3f8ccd8aa492dea9a4e538355aa2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, suggesting an attempt to lure users to malicious infrastructure. 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.com/pify?keyword=case+study+interview+questions+and+answers+pdf
    • http://files.reikiwithlouise.com/uploads/1/3/2/6/132682813/3120327.pdf
    • http://boniz.vintagewoodworkingtools.com/uploads/1/3/2/6/132682663/wezafekafe-vonazazeka.pdf
    • http://files.southhickoryhill.com/uploads/1/3/1/4/131454521/6612d2575b25.pdf
    • http://zidodi.meganssewingroom.com/uploads/1/3/1/4/131437130/8974714.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5280/0920/files/gitufifuxenekezokir.pdf
    • https://cdn.shopify.com/s/files/1/0436/7794/1913/files/98733273331.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/migebakiziferobotababoviv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0146/files/jejixajebugaziwokog.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6534/files/chakras_for_beginners_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdf
    • https://cdn.shopify.com/s/files/1/0450/7402/2550/files/forex_swing_trading_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/68132885706.pdf
    • https://cdn.shopify.com/s/files/1/0441/1329/7560/files/tixojuwazuma.pdf
    • https://cdn.shopify.com/s/files/1/0447/8137/1543/files/fetufasigazasanis.pdf
    • https://cdn.shopify.com/s/files/1/0436/9632/4758/files/wixepazosalad.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/kabidasajizazavagin.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070b6.bin
4f5c98f6adc91c877ac65a786658a83fdb74c8a1005dc3424b56e40dbe2af34f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B6 5288 bytes
font_01_sfnt_off000082d8.bin
7fdeb2fe0685f5df7085875a9180fd91b02fd11e0d258c840e8ebd323b50a3f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D8 9980 bytes

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