Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae745c692bc0e01…

MALICIOUS

PDF

42.3 KB Created: 2020-08-20 07:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af0c373c22d3262512922f6514d2d92 SHA-1: 33c4c52aabb1852ea0cb121be9641b5828ae3720 SHA-256: bae745c692bc0e01b23cd347c8a8dd448fda76511d5e4895ba90fcd05775ea16
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate PDF files hosted on domains like shopify.com. However, one critical link points to a known malicious redirector, ttraff.com, which is likely used to deliver further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=carrier+transicold+reefer+manual
    • http://files.wiltonneighbourhoodplan.info/uploads/1/3/1/6/131636995/zilelatisad_rojirogixi_xirude.pdf
    • http://kapesumo.corolib.com/uploads/1/3/1/3/131383664/9770605.pdf
    • http://rinuwoje.colorwheelsmobileartroom.com/uploads/1/3/0/7/130739678/vipipivek_vowerubub.pdf
    • http://ledaf.belmonthighlibrary.org/uploads/1/3/0/7/130775075/lisata.pdf
    • http://gimawud.nazosdb.com/uploads/1/3/0/7/130775448/zoniwakufironasumisa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/rjc_inmate_lookup.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/preparation_of_benzophenone_oxime_from_benzophenone.pdf
    • https://cdn.shopify.com/s/files/1/0436/9891/3435/files/limibuzabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9639/files/rudipaxonufekape.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/dixikobuwizemajesen.pdf
    • https://cdn.shopify.com/s/files/1/0433/8604/4570/files/vixutelamavukorivi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/kefisulezotilaxexosetixu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0525/5586/files/95326198952.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/way_back_into_love_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/fha_appraisal_guidelines_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/57633084216.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_off000068fc.bin
5de85bacb4c7bddae684daef2fc40044d4188fbddcd5a76d92271c4288f1ea47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FC 5072 bytes
font_01_sfnt_off00007a1e.bin
57552fbf5ef9e8204d688140377e61c86afa73aabf2c6c1ab5df1ab5b0293cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1E 10044 bytes

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