Malicious PDF — malware analysis report

Static analysis result for SHA-256 49eaec7a30fa1721…

MALICIOUS

PDF

38.2 KB Created: 2020-08-08 01:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7bba9674e82579cad5df4d02422c4ce SHA-1: f9cf238996887283d676b2429f0a04cc0f5afba4 SHA-256: 49eaec7a30fa1721bf4aa7da476795dc5958712746d1db75a3f9e749a64289b0
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains, which is indicative of a link farm designed to obscure the true destination. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=celta+course+book+pdf+free+download', suggesting this is the primary malicious URL. The document body also contains this URL, reinforcing its role in the attack. 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.cc/pify?keyword=celta+course+book+pdf+free+download
    • http://files.eatnoodlehub.com/uploads/1/3/2/7/132741486/c28e8f2856.pdf
    • http://files.duairak.com/uploads/1/3/2/6/132681213/wagageburof.pdf
    • http://files.globaltesoltraining.org/uploads/1/3/1/6/131606694/638639.pdf
    • http://files.callylawson.co.uk/uploads/1/3/1/3/131380305/bifezopigogalarawaki.pdf
    • http://files.besteducationaldeals.com/uploads/1/3/1/4/131454670/kotaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/0795/9452/files/15811188595.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/desodutotomupota.pdf
    • https://cdn.shopify.com/s/files/1/0438/8916/4440/files/3837320381.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5281/files/javascript_get_mouse_position.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/18316419075.pdf
    • https://cdn.shopify.com/s/files/1/0438/6711/1584/files/difference_between_analog_and_digital_electronics.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/tofatepakaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/kurozetozaponikagapiven.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/boot_partition_full.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/80109930188.pdf
    • https://cdn.shopify.com/s/files/1/0440/0798/1214/files/89593011427.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_off000056bf.bin
3f9666b7ddf8ca6d127469a3a04fa32d63ca6de87c9addedc0581ed1961a1836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56BF 5352 bytes
font_01_sfnt_off0000690a.bin
7d4139bcd06a27590efcb385994d63287cb088ef74166aa39fd96945e72a2c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690A 10080 bytes

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