Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bab83b8b25d6ba3…

MALICIOUS

PDF

92.5 KB Created: 2020-08-12 01:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7eb2c3d1a37d1169dace307cd738c3e SHA-1: d44d526cbf344a82552fb3030a6c3479b2a5e921 SHA-256: 8bab83b8b25d6ba311ea44fa82ac82ae4845361defbce463dc4cb0d2fe12f14d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the URL https://ttraff.cc/pify?keyword=joint+normal+distribution+pdf is part of known malicious infrastructure. Additionally, the 'PDF_SEO_LINK_FARM' heuristic suggests a large number of outbound links, many hosted on cdn.shopify.com, which is often abused for hosting malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of these malicious links points to a phishing or redirection attack.

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=joint+normal+distribution+pdf
    • http://files.huntcountytexasmissing.com/uploads/1/3/0/7/130776578/silubipusara-legowepezegogu.pdf
    • http://files.brandonbulletteart.com/uploads/1/3/1/3/131383478/mejifib-mikozapa-sunufe-lelufarilusopon.pdf
    • http://vulifu.thequiltingretreat.com/uploads/1/3/1/3/131380600/miwisozakojabadujon.pdf
    • http://files.steve-keating.com/uploads/1/3/0/7/130775053/jeluvesesa-tidiwuno.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/gujeraduboxun.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/microsoft_visual_basic_2015_reloaded.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6317/files/jean_anouilh_antigone_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/71636174864.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/migikazivenoje.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/paul_feyerabend_against_method.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/narrow_spectrum_antibiotics_list.pdf
    • https://cdn.shopify.com/s/files/1/0449/3423/4280/files/materiales_no_metalicos_polimeros.pdf
    • https://cdn.shopify.com/s/files/1/0452/2229/7760/files/materiales_ceramicos_clasificacion.pdf
    • https://cdn.shopify.com/s/files/1/0450/3358/6838/files/39946854228.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_off000102db.bin
114acb2802d3a4851d6774630a064954a6a06aa09c83db4097950a2d90d7f8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 5316 bytes
font_01_sfnt_off000114c8.bin
fb9e2413205fee747562b6dccec62f6a9b0167c903f9ba292b1fe110a5ea9adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 17652 bytes
font_02_sfnt_off00014cb6.bin
546dfa4a3be4f7dc7cd0188b915af7bb0049b2a4b487d48c2ae0932b12e4faf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB6 16744 bytes

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