Malicious PDF — malware analysis report

Static analysis result for SHA-256 270cb9c4f5a31d82…

MALICIOUS

PDF

44.5 KB Created: 2020-08-04 09:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b1544ee98c4094928a860cb8b91e72 SHA-1: c6aece1adcd9885e189c1e5f4393dc92aca4bd4c SHA-256: 270cb9c4f5a31d820fd63be4464a22a3a00741dfbc7fdc4f58594c3303957b97
152 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'multiplication word problems worksheets grade 3 pdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms the delivery of a malicious payload.

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.ru/pify?keyword=multiplication+word+problems+worksheets+grade+3+pdf
    • http://files.johnnyomusic.net/uploads/1/3/1/4/131437775/e675ec8.pdf
    • http://files.nolaninc.net/uploads/1/3/2/7/132740329/vepafiworunexo-zarine-xuzuv.pdf
    • http://files.buttehomelesscoc.com/uploads/1/3/1/4/131406701/0b845223c69.pdf
    • http://files.ctklutherannewtown.org/uploads/1/3/2/7/132712358/6deabc3137c.pdf
    • http://files.oakgrovechristianschool.com/uploads/1/3/2/7/132740270/7703140.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/sun_l_scooters.pdf
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/konufotelekidejusuwudeju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/autodwg_dwg_to_converter_2020_crack.pdf
    • https://cdn.shopify.com/s/files/1/0430/9109/9805/files/56685453781.pdf
    • https://cdn.shopify.com/s/files/1/0432/1938/6526/files/jonikum.pdf
    • https://cdn.shopify.com/s/files/1/0432/2204/0731/files/gurijakimofosala.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/80991086747.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/mugabumexazate.pdf
    • https://cdn.shopify.com/s/files/1/0433/2440/7961/files/41528985888.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/22815311678.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/vated.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_off00006e8f.bin
210551b9930f6495c14a1d6461215ca9bd75671792b0fd1f9d36fd3ad662a6ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8F 6032 bytes
font_01_sfnt_off0000830a.bin
bee4f5a7743634c8f17a463f6dcbfda3b815daffa658fc1cdaf5070e1f5b5d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x830A 9816 bytes

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