Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0d3930f29c0aef…

MALICIOUS

PDF

47.7 KB Created: 2020-08-04 23:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c21d3810949c328ff1ebaae914445bc SHA-1: 89e97b2134d37989d00e18ec52d54f3c869f714b SHA-256: da0d3930f29c0aef9b63f73e0341d58945f48d45bc3a1f46640de6b82a441e2a
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector service, ttraff.com, which likely serves to obfuscate the ultimate destination of the attack. Another critical heuristic noted a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The document body contains garbled text but also includes the suspicious URL and several Shopify-hosted PDF links, some of which are confirmed benign while others are unknown.

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=neurofibromatosis+tipo+1+pdf+2020
    • http://files.primrosetable.com/uploads/1/3/1/3/131381471/923578.pdf
    • http://fawukepab.greenevillewomansclub.net/uploads/1/3/1/3/131379578/muwufaxosurajok.pdf
    • http://files.mindnetwork.us/uploads/1/3/0/7/130776521/b848d3a23a.pdf
    • http://files.kolbyvancamp.com/uploads/1/3/0/8/130874064/korifineda_roxevopo_jawowifekinaje.pdf
    • https://cdn.shopify.com/s/files/1/0435/5253/8773/files/how_to_set_up_act.pdf
    • https://cdn.shopify.com/s/files/1/0432/1860/0103/files/71575927318.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/sazopupasapezebapofe.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8533/files/farm_simulator_2015_xbox_one.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/23163783620.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/34789341006.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0085/files/nunabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wuwikeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/vatativam.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/kodizozoga.pdf
    • https://cdn.shopify.com/s/files/1/0435/4277/3914/files/42029463235.pdf
    • https://cdn.shopify.com/s/files/1/0432/0552/5661/files/the_last_hope_warriors.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/davafizexudasebolizuriga.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/address_in_new_york.pdf
    • https://cdn.shopify.com/s/files/1/0438/6032/8608/files/xepinu.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_off00007b89.bin
a646faae5595902d65d9133b3c1d0d37971bb6b3dee65fcd6fbfb87db6b002bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B89 5588 bytes
font_01_sfnt_off00008e73.bin
ddecab7a2735bc7ba633dbc7bc227052fea2147fab20aaa313b00af4e82816be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E73 10448 bytes

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