Malicious PDF — malware analysis report

Static analysis result for SHA-256 a483847c9fcf56db…

MALICIOUS

PDF

43.4 KB Created: 2020-08-16 13:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ffa4bda6af1a7d2120aaea843cf457 SHA-1: 11617ca7b36e2becacf1a9f27f706e9e20de4355 SHA-256: a483847c9fcf56dbec4c5f068c7326e3ac953f08236a431e57b286d1fd7ed47d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL, suggesting a lure for users searching for educational materials. The PDF also contains a large number of external links, many hosted on cdn.shopify.com, indicating a link farm strategy. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=northstar%20building%20skills%20for%20the%20toefl%20ibt%20intermediate%20pdf%20download
    • http://files.houndshangout.ca/uploads/1/3/1/4/131407761/2803822.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1567/files/demed.pdf
    • https://cdn.shopify.com/s/files/1/0433/1791/9909/files/rogogituxodamudixel.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1281/files/82224915759.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/jevifagizajolamosuxis.pdf
    • https://cdn.shopify.com/s/files/1/0435/2504/6431/files/2020_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2166/files/pajererakovube.pdf
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/zulaxonizeguluzaxul.pdf
    • https://cdn.shopify.com/s/files/1/0436/0372/2398/files/bositezaxewikagagelinipuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/ketifenefodalezurasip.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/40730920964.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/reliability_analysis_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7696/files/71424944632.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/matura_podstawowa_angielski_sownictwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/91834832105.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_off00004f19.bin
f91078c93928e92f82ac57e082ea3041dc7d100625cf685a62ac8a424756b29a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F19 5720 bytes
font_01_sfnt_off0000627d.bin
5dbd37542caa23e9386b7462883099cc14e9fa60801a58b68f26cb26fb6741ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627D 13196 bytes
font_02_sfnt_off0000890a.bin
d3099b04294705fbd98edf3ec0384a2ca2423171a7a91634e670a652ef97bb2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890A 16648 bytes

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