Malicious PDF — malware analysis report

Static analysis result for SHA-256 8922481ef3860051…

MALICIOUS

PDF

48.3 KB Created: 2020-08-16 00:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0323fd9d7288b3a4659d4cdd06fbe54 SHA-1: d3c26d0a08fe9bf23a31db835b66e8d746561429 SHA-256: 8922481ef3860051eb0669fa32bea78cef26896ffb84aaa9e49c899ad52890c9
154 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, indicating the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, as flagged by 'PDF_SEO_LINK_FARM', suggests an attempt to distribute or mask the malicious content. No scripts were extracted, but the document body and heuristics strongly suggest 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/wb?keyword=lehrplan%2021%20nmg%20pdf
    • http://files.nekrubs.com/uploads/1/3/2/6/132681690/990145f2bb7.pdf
    • http://rixel.wiseguyparanormal.com/uploads/1/3/0/8/130874075/botevadimax.pdf
    • http://kejon.metachangetherapies.com/uploads/1/3/1/3/131397987/relagoragedogov_voromapixogobi_vifezemekil.pdf
    • http://files.pawsablyhome.com/uploads/1/3/1/4/131407692/kobowemarozopivo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0398/files/33933938857.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/micheal_phelps_smoke.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/47607295430.pdf
    • https://cdn.shopify.com/s/files/1/0434/5033/5384/files/neurokinetic_therapy_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5781/4431/files/ahsan_ul_hidaya_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3133/files/18._2_modern_evolutionary_classification_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/8922/3066/files/tefexilode.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/best_bed_sheets_cotton_polyester.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b54.bin
3039919a0d273771326c9466486bca8d44d811ef1a2ac9c79b8346ff9980e7b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B54 4952 bytes
font_01_sfnt_off00006be8.bin
cfc86a424402d475fb3aec1dd98a4e2720f2e02d4f9aee469a22554d3006adc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE8 11060 bytes
font_02_sfnt_off0000905e.bin
df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x905E 16060 bytes
font_03_sfnt_off0000a4f4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4F4 4324 bytes

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