Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f58709ece081711…

MALICIOUS

PDF

43.4 KB Created: 2020-08-07 19:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 713b93dc716b6f345ea5c5701dbfca90 SHA-1: 613ab044c1525c723ef712397407b85fdbb40b59 SHA-256: 5f58709ece081711fb28293afd08fd4365e19fcf1a238890ff96c4acb6963991
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The primary malicious URL identified is a redirector that masquerades as a link to a 'social psychology studies pdf'. This suggests a phishing or scam attempt, likely using a spearphishing attachment vector. No scripts were extracted, but the PDF structure and embedded links are indicative of malicious intent.

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=social+psychology+studies+pdf
    • http://files.mistyhollowfarm.net/uploads/1/3/1/4/131453348/9206634.pdf
    • http://files.realsynergycommercial.com/uploads/1/3/0/7/130776158/c56c5e8409b.pdf
    • http://files.katiebeaneyoga.com/uploads/1/3/1/4/131482952/34ce98c4255b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/34181197597.pdf
    • https://cdn.shopify.com/s/files/1/0434/1363/5226/files/82474748305.pdf
    • https://cdn.shopify.com/s/files/1/0437/9020/5090/files/list_of_countries_in_the_world_by_continent.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/aristotle_s_politics_carnes_lord.pdf
    • https://cdn.shopify.com/s/files/1/0437/4642/7034/files/tumulaxax.pdf
    • https://cdn.shopify.com/s/files/1/0440/6516/1366/files/sejumazusow.pdf
    • https://cdn.shopify.com/s/files/1/0435/4729/5898/files/52812654990.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/9868769796.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/99201088006.pdf
    • https://cdn.shopify.com/s/files/1/0434/2969/1558/files/dasaximomupata.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/42932706422.pdf
    • https://cdn.shopify.com/s/files/1/0440/2036/7510/files/limujajumazawemikekim.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a0.bin
eb3513303e4af7a09759ff712dd51eb4e9aedb8a696baf586ed14eb2928003f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A0 5528 bytes
font_01_sfnt_off00007c73.bin
26f95c416eb318a4033f05900bc7811d19e1efed8825bf49180bbc2638aec3d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C73 10760 bytes

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