Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6fd56359420acf…

MALICIOUS

PDF

48.1 KB Created: 2020-08-03 22:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df3d9865d0a7d09ff9d72477844af76e SHA-1: 194f73e5b75407abb907632f52d4abb08a9932b9 SHA-256: 1b6fd56359420acf600b70990a351930d6c010662b260953b11c3d4d9ddab908
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting an SEO link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs point to suspicious infrastructure, with https://ttraff.ru/pify?keyword=abstract+class+and+interface+in+java+pdf being a notable redirector.

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=abstract+class+and+interface+in+java+pdf
    • http://files.dannyandmickey.com/uploads/1/3/2/6/132695416/9539604.pdf
    • http://files.g-icide.com/uploads/1/3/1/0/131070591/6edf909518bda51.pdf
    • http://files.baak.ca/uploads/1/3/2/6/132683000/degafilofelan_bizikerilapepo.pdf
    • http://files.urconqueror.co.uk/uploads/1/3/1/8/131856161/remawudotibinur.pdf
    • http://files.elizabethbarattalmhc.com/uploads/1/3/1/6/131636890/1525641.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78299439052.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/57260941803.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/duwoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/bizumikut.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/79997948602.pdf
    • https://cdn.shopify.com/s/files/1/0433/5796/2405/files/16800365992.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/43198807887.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3215656586.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0802/files/latex_to_word.pdf
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/50437132722.pdf
    • https://cdn.shopify.com/s/files/1/0429/7631/3503/files/18579078934.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/91124926111.pdf
    • https://cdn.shopify.com/s/files/1/0428/9930/8711/files/86136711292.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tozonolemudafolafoxi.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_off00006e78.bin
3945b3684ea09e6a1889d0ee36ecdcc0092e0504374b53ebb541effe49b0eb8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E78 5092 bytes
font_01_sfnt_off00007fd0.bin
9eae244cec4d687b7edbb27ca87f4ecad04f970c1ed3d3f44fc4608ae31fce88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD0 10928 bytes
font_02_sfnt_off0000a4f5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4F5 4324 bytes

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