Malicious PDF — malware analysis report

Static analysis result for SHA-256 621e57c60e956d6d…

MALICIOUS

PDF

49.2 KB Created: 2020-08-30 10:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2191eb477723427347973c16f4d4f210 SHA-1: bab6496479f12fe772a2b9510e5e7fdc2dd53bb1 SHA-256: 621e57c60e956d6dca8a151c8b0e90de02fa0f7701f96d8503e3bd6d24d94e6a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for malicious content. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to harmful sites.

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.com/wix?keyword=bahubali+2+sub+indo+mp4
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vonabubabosutogoxofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8774/0576/files/31583910888.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/anomalias_dentarias_en_odontopediatria.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/terraform_aws_ec2_auto_scaling_group.pdf
    • https://cdn.shopify.com/s/files/1/0438/9155/6504/files/japanese_slanted_smiley_face_answers.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8c3f96b8e13470b834a4425a36cae95.pdf
    • https://static.usrfiles.com/ugd/e5a943_b5275906ab524684ba9da6c40e66aeb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbf61614925c45b59beeea5a0c209236.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7cc99874ed64601ab3f186fd024d79d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fb4484087e64ace9d7fdfd0b98e83e3.pdf
    • https://cdn.shopify.com/s/files/1/0437/4567/3377/files/tilimopozusotilotakopos.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4665/files/botolukaloranamowidawevez.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/rezeluvolobivevovigo.pdf
    • https://static.usrfiles.com/ugd/857e61_a04e071581b449e18938f18252f1854d.pdf
    • https://static.usrfiles.com/ugd/fd7405_0827a95fa43b482eb0022ab81009cc54.pdf
    • https://static.usrfiles.com/ugd/a298ce_194d877236e745fb82f094931930bed4.pdf
    • https://static.usrfiles.com/ugd/76156b_8e9484578e7b49cf9fe09901a6700b0e.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006092.bin
467b4371c0fdcd353f2d40240552155bec8b35d8552c46c54639a084dbc24f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6092 5512 bytes
font_01_sfnt_off00007317.bin
c206ac4eca120f096112d408dff6b33a2f721090936d80486df636e1cd240fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7317 2656 bytes
font_02_sfnt_off00007e1c.bin
e66bd646ff29f48b94a898642357a1d5295b77faffa0bd70eb77acb4aebc9a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1C 2108 bytes
font_03_sfnt_off000087f3.bin
7bed77e2a7b5fcc0192ab9caf686c6943d699a5820729e7a390e5f233d3fe12f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F3 15356 bytes

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