Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4c5d04d2ab79a0…

MALICIOUS

PDF

49.0 KB Created: 2020-08-08 13:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aceb97177fb0781b294238435c8124af SHA-1: c956959352e709033bf83ea2e628d48e13ed1e9b SHA-256: 0d4c5d04d2ab79a0667fd2c76d5f2b2b7ff1b62748dd16cf201178141e1851ba
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to lead the user to malicious infrastructure. The document body, though obfuscated, contains the text 'Nepali language course pdf' and a URL that matches the malicious redirector, suggesting a lure for users seeking educational content. The presence of numerous links to external PDFs, many hosted on Shopify, further supports the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=nepali+language+course+pdf
    • http://files.tableandelights.com/uploads/1/3/1/0/131070733/kadididuwisura_bukujorezi_pupofaxidope.pdf
    • http://files.jodymorse.com/uploads/1/3/0/8/130874680/kiburugoreramuf-vovidajavofi-muxos.pdf
    • http://files.zatacademy.com/uploads/1/3/1/1/131163632/gosativoleritet.pdf
    • http://files.tarjac.com/uploads/1/3/1/3/131398487/zizelozufexopof-ponebilumejuviv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6114/9850/files/xawiwutekeralurosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/dewebilulexaribopoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/nedisasudike.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0919/files/merogixig.pdf
    • https://cdn.shopify.com/s/files/1/0436/1145/5645/files/alcohol_abuse_effects.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/samsung_galaxy_s2_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/the_juvie_three.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/saketabanevoselujavadu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/49121213170.pdf
    • https://cdn.shopify.com/s/files/1/0437/0114/1657/files/96333380661.pdf
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/alarm_check_valve_working_principle.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/workday_hcm_training.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007459.bin
6813c00c8cfc32bee14c97fd6e9e72a12c3871ec245e032040d384235261394d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7459 5092 bytes
font_01_sfnt_off000085ac.bin
91bf374df292dd8707df04992ffcebd37481cb02a48adcb3f74d52bfa930deea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85AC 10316 bytes
font_02_sfnt_off0000a8ed.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8ED 4324 bytes

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