Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb57374d1b972d93…

MALICIOUS

PDF

105.4 KB Created: 2020-08-07 01:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d2ae4e54f8ca6611adc6c8d5ca2176 SHA-1: c3b3ada5697a19c306aac151ab1e74b44b8adb42 SHA-256: bb57374d1b972d931aaa19f81719c30b26ccbe079032332749b70903bed2c5ab
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, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=actemra+bula+profissional+pdf', is designed to lure users into clicking it. The PDF also hosts a large number of external links, many pointing to Shopify, suggesting a link farm or distribution method. The ML classifier strongly indicates maliciousness.

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=actemra+bula+profissional+pdf
    • http://files.equipasia.net/uploads/1/3/2/6/132681758/6098381.pdf
    • http://files.sageswisetraveltalk.com/uploads/1/3/1/3/131379639/wujegokirujo-fafolipibatupa-kigikoguk.pdf
    • http://files.crownoftexasarabianhorseclub.com/uploads/1/3/0/7/130740165/kavijegapal-finidelin.pdf
    • http://files.awavearoundtheworld.com/uploads/1/3/1/4/131407547/kiwukut.pdf
    • http://files.hannahrasch.com/uploads/1/3/2/7/132741476/puzibunefezupojeji.pdf
    • https://cdn.shopify.com/s/files/1/0429/7841/0655/files/sekuwesapipebupako.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gadawatozuwagujezudoru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwizesovipijekugufex.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0021/files/gipifarizogipixezezoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8632/2600/files/danumuzixadarix.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2653/files/mozomujedakipigane.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/korelesedokarifo.pdf
    • https://cdn.shopify.com/s/files/1/0444/4412/3303/files/medical_biochemistry_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6161/files/kuvatatogetononojagu.pdf
    • https://cdn.shopify.com/s/files/1/0439/6577/6030/files/kegogutobosivewizired.pdf
    • https://cdn.shopify.com/s/files/1/0433/2329/3864/files/66135477569.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7791/files/borg_scale_copd.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/zitil.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5832/files/91006681242.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_off00015328.bin
4b556cf4ad91b1b65a6f4226e70349f53190f0ba512ee25fa8c3d7ceb6fec3ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15328 5432 bytes
font_01_sfnt_off00016583.bin
ca7c415b80360a4bda918ed8a3564206bbc6e68f691103c6d89dc751e2f8eeb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16583 17116 bytes

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