Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a58c3250e30013…

MALICIOUS

PDF

55.5 KB Created: 2020-09-11 02:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9902de8656f3bde848b9ddc2807bfaa SHA-1: 2089a4b5c6c4979a4b626cb0761b9af1186a6131 SHA-256: 17a58c3250e30013bf31bdf1869c16994cd7f11c73bcde2694f845943b0d625e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded links that lead to a known malicious redirector and a large farm of external PDF links. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for a commentary app. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, including one to a known malicious redirector, indicates a phishing or redirection attempt.

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.link/wix?keyword=enduring+word+commentary+app+for+android
    • http://zevapowa.michelepetersonart.com/uploads/1/3/1/4/131405965/redazusopolide.pdf
    • http://files.heronmediagroup.com/uploads/1/3/1/6/131637853/9791184.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fudotemo.mgalbraith.people.ua.edu/uploads/1/3/2/6/132695478/pugidaxetinu_gunawiv.pdf
    • https://static.usrfiles.com/ugd/3a38e0_98d7e58a91df4caabfe52cccf71e97e5.pdf
    • https://static.usrfiles.com/ugd/4b7290_0c9c1bd2a23848f987bcf575037405bb.pdf
    • https://static.usrfiles.com/ugd/6166c9_a92d6a1784b446349f6c7710db32e355.pdf
    • https://static.usrfiles.com/ugd/8acad3_1ed854a68790451fb07f848dca26e330.pdf
    • https://static.usrfiles.com/ugd/e80f4c_470917c56d224d62b6eecb3dad661a7b.pdf
    • https://cdn.shopify.com/s/files/1/0432/4471/6199/files/tesadupewujebalo.pdf
    • https://cdn.shopify.com/s/files/1/0463/4119/3885/files/45509829923.pdf
    • https://cdn.shopify.com/s/files/1/0437/7113/4106/files/69704222773.pdf
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/matugixuduperejodoxobozo.pdf
    • https://static.usrfiles.com/ugd/493135_501f10c5fb5649d191630d197b5cf001.pdf
    • https://static.usrfiles.com/ugd/74a852_7a94a7afa0eb4470b9076eb6d7f5b28a.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf663ef75b884e2ba445f1a2d681b5c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_18b3baab214b41f598f3cd842f920fd3.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
    • 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_off00006917.bin
826b2b8131be038f071dabdd31ff967c6fb9a1d8a965b6320403c3c5d979bd57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6917 5296 bytes
font_01_sfnt_off00007b0a.bin
5999488002732b0f0723d716cec0eee1259b5d2994a6646fa6e5afaf1dbf04e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0A 4120 bytes
font_02_sfnt_off000085fa.bin
a7ceab81332af83d5601b7868c898a049995ce8e774468f84f297eb18293d027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FA 10900 bytes
font_03_sfnt_off0000ab52.bin
e4d5c64c26d6d24f1a0f3ac5ae3912a2440227e087dc546a24e72d8296ef477b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB52 16736 bytes
font_04_sfnt_off0000c202.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC202 4324 bytes

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