Malicious PDF — malware analysis report

Static analysis result for SHA-256 1251d30bed1400e1…

MALICIOUS

PDF

71.7 KB Created: 2020-08-29 15:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f7d40439ce0433c9fc7dd3e34cfe53a SHA-1: c06f0d0506fab543d81c25154150ac7f380f6caa SHA-256: 1251d30bed1400e1b2cd510b8bbd278946af6ce4a2c23be6bea25c97f97e0285
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 external resources. One critical heuristic identified a link to a known malicious redirector, suggesting an attempt to direct users to malicious content. The document body, though heavily obfuscated, contains the malicious URL and appears to be part of a link farm strategy.

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/wix?keyword=roguelike+adventures+and+dungeons+se
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_563e00509e5f4d25a3223ff5547c9d4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7de014100b8241b9abae2cccd0627259.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd07b4a2eac2446b842baa1a30769680.pdf
    • https://static.usrfiles.com/ugd/b8c837_f00786febb774dfcb39f79a1bc40f0bc.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/sbi_bank_personal_loan_form.pdf
    • https://cdn.shopify.com/s/files/1/0441/3066/4600/files/97112621393.pdf
    • https://cdn.shopify.com/s/files/1/0450/9014/4421/files/59277216422.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e21ccbca95d4bb39aa29dc03c6e41eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfc2266b12354d6bb593e96dbaea740c.pdf
    • https://static.usrfiles.com/ugd/b8c837_235f415b5d794238838a0d95b049f254.pdf
    • https://static.usrfiles.com/ugd/b8c837_270e606902264b7b99ef22250449bfd0.pdf
    • https://static.usrfiles.com/ugd/b8c837_437b816604f8413ebdc2ca9ed416a3bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_72a8694667944921a2d1341581369d6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_685c5de96c4c4fb7b9e312da8da0a627.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e4c.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E4C 6744 bytes
font_01_sfnt_off0000af31.bin
169cf643fb52e130920325f19290e5e9360570e803b82e8461f89a375f354bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF31 5124 bytes
font_02_sfnt_off0000c0b1.bin
0810ce0371bb48a6dbbb6c56d423a1e4bda4455f4638deeed9c91ec23a796c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B1 1728 bytes
font_03_sfnt_off0000c949.bin
772ff2305db6fb8d9d7135d23a8157c3173d7e0610e3969a90eac1d1aa23ad67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 16272 bytes
font_04_sfnt_off0000fbf3.bin
6f41d85279102efce3c4bd26fddb767baf9b68a4f55e239fba9bedc2a2d3b953		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 16064 bytes

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