Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c3662b9c8a3e2a…

MALICIOUS

PDF

44.7 KB Created: 2020-08-22 18:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed496f63cf3adec61f54fe334a81b431 SHA-1: de935158933460e3200ea90afa6386416510febe SHA-256: c6c3662b9c8a3e2a5c923253f2e74ab680c16a5de1551dd5306ef9c4c17be858
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though corrupted, contains the URL 'https://ttraff.ru/pify?keyword=pte+pearson+score+guide', suggesting a lure related to test scores. The presence of a link farm indicates a likely attempt to distribute malware or phish users.

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=pte+pearson+score+guide
    • http://files.hitchhouseusa.com/uploads/1/3/0/9/130969265/nuwixudapulezu_numozupolabeb_banubexilo_wiravefodogevu.pdf
    • http://files.renagadeapparel.com/uploads/1/3/0/7/130738969/nalebu_kevuma_kubemi_gebikujigup.pdf
    • http://files.younglifeplano.com/uploads/1/3/1/4/131438059/nolox.pdf
    • http://files.globalqualityenglish.org/uploads/1/3/0/7/130739524/jaxodajerizag_babum_bukojusaf_zomej.pdf
    • http://samir.lightfastdesign.com/uploads/1/3/1/3/131383726/9032314.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6604/files/lawafabafebularebat.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/25434519548.pdf
    • https://cdn.shopify.com/s/files/1/0430/4220/9945/files/bitter_foods_list.pdf
    • https://cdn.shopify.com/s/files/1/0439/8769/7822/files/story_map_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/agri_wizard_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/14437216228.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/social_identity_theory_definition.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/gunugapowigigakorajobako.pdf
    • https://cdn.shopify.com/s/files/1/0437/1116/8664/files/notunogaxuzasetu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4683/7151/files/antenatal_care_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/4729/4875/files/bikitotekeguxenedife.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_off000070a1.bin
cdffc1f489c91738002b91dca0a053744f9411039e99e475fd9b4a6fcb068950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A1 5208 bytes
font_01_sfnt_off0000825b.bin
2b119ec54778275779005a9b8e6248aedf42cc9824907212b8ecc398e1102fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825B 10480 bytes

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