Malicious PDF — malware analysis report

Static analysis result for SHA-256 5642916b63b6c45d…

MALICIOUS

PDF

49.3 KB Created: 2020-08-10 23:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc7dd448f33ef3e8b28ea0fddbefbd6e SHA-1: a70c33e9415162daf71712426876e6e0ad502ae0 SHA-256: 5642916b63b6c45d4eb8c1f515c8d12dc1b305c6cf63eb653a62098fcf03cf18
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.cc. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains the malicious redirector URL, suggesting the primary purpose is to redirect users to malicious content.

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.cc/pify?keyword=serum+protein+electrophoresis+patterns+pdf
    • http://files.bereanri.net/uploads/1/3/1/3/131379296/saxuwise.pdf
    • http://files.fizzbathco.com/uploads/1/3/2/6/132682806/nuluvomudeguda_disinasosunepu_debelafi_saratijopawadir.pdf
    • http://files.how-queer.com/uploads/1/3/1/6/131636914/xawegajurudakex.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/moziximigetadilop.pdf
    • https://cdn.shopify.com/s/files/1/0438/2621/7120/files/insulated_concrete_forms_disadvantages.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/estonia_visa_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0436/5657/7182/files/animal_encyclopedia_with_pictures_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/nexus_3_vst.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2184/files/reguzaxukudaxiduwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/pepipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/56381805414.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/noblesse_oblige_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/votirojozevexiweremit.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/zosirefawepabedam.pdf
    • https://cdn.shopify.com/s/files/1/0428/0506/7943/files/hygiene_and_sanitation_in_ethiopia.pdf
    • https://cdn.shopify.com/s/files/1/0437/8584/6933/files/pujifuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/1719141585.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/41430166284.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_off000074e6.bin
2a9a24e8dc2815e21f8a02f771bd3b10d1ecb050747d5c79d6dff8f734c01a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E6 5380 bytes
font_01_sfnt_off000086ef.bin
e1002bebf79f4d7fd901da36351fc473693430409c48cb9e900e1a99ee7494a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86EF 10132 bytes
font_02_sfnt_off0000a9b7.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B7 4324 bytes

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