Malicious PDF — malware analysis report

Static analysis result for SHA-256 368093b8ea6bf399…

MALICIOUS

PDF

49.6 KB Created: 2020-08-22 09:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09067ef2ad73692a7af20ea2d0a38ffe SHA-1: 7e3221742bbd034e99eaae5b2ad8954ccce8d648 SHA-256: 368093b8ea6bf399235b4a4b4284761df18f8c75a407219070cb58ad7ef79423
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text related to 'adding mixed numbers worksheet math aids' and a URL pointing to a redirector. This suggests a social engineering attempt to direct users to malicious content, likely for further exploitation or credential harvesting. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=adding+mixed+numbers+worksheet+math+aids
    • http://files.seasparishlo.org/uploads/1/3/2/3/132302855/libovemogox_kinabepilob_basidubetelu_xifivexur.pdf
    • http://giron.mattevanskc.com/uploads/1/3/2/8/132814930/sinaxiwabajupikazuna.pdf
    • http://jepilasu.aframstoryretreat.org/uploads/1/3/1/4/131406515/topufisew.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1952/files/jekuzunixebomus.pdf
    • https://cdn.shopify.com/s/files/1/0429/1136/7331/files/click_plc_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/81144048072.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/lorufanizokenezisufafurar.pdf
    • https://cdn.shopify.com/s/files/1/0450/4210/6518/files/access_control_installation_training.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/gujajerederuferiloviviz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/98253342073.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/dutujawajunefoxugujedoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/73691748314.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/keronibinatulujejikixutam.pdf
    • https://cdn.shopify.com/s/files/1/0433/4436/3678/files/fipikapogagejomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/39403339328.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0899/files/metformin_500_mg_uses_in_telugu.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_off000074fe.bin
9f542362dd7d4939930843483297e6a6b98b896f825a4201443ca4a93b3140f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FE 5444 bytes
font_01_sfnt_off00008755.bin
7fda3315e08f24ea2c0cf2e747a8f439d91c526cfb3a6aa9af4beb041391cd68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8755 10592 bytes
font_02_sfnt_off0000ab57.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB57 4324 bytes

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