Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b67a1726e12d30…

MALICIOUS

PDF

51.2 KB Created: 2020-08-09 04:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 713cb107bf9b81676a450c9f7731d910 SHA-1: 7ace44869bced0d1a987014c6dadded0004bc4a4 SHA-256: 79b67a1726e12d3087ccd5925f731aaa3421f820ca8e2f4246a959737b776fc4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The document body, though heavily obfuscated, contains text related to college applications and a URL that appears to be a lure. The presence of a link farm further indicates a malicious intent to distribute links.

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=applying+to+college+checklist+pdf
    • http://files.dori-shasha.com/uploads/1/3/0/7/130776042/lumipopexuxod_zakedawesinezum.pdf
    • http://mojoti.takaikari.com/uploads/1/3/1/8/131871390/01285.pdf
    • http://files.ibizarentaudio.com/uploads/1/3/1/3/131380000/4796740.pdf
    • http://files.decadesboutique.com/uploads/1/3/1/3/131380741/fuxolekaxaz-pamitakuwapa-numelenipisoxu.pdf
    • http://files.sparkybuddy.com/uploads/1/3/1/3/131380213/fevajozudibof_gopefed_natanem_fubixu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/6127/8870/files/43897794498.pdf
    • https://cdn.shopify.com/s/files/1/0433/7329/7822/files/lajabovafegifimegatazoju.pdf
    • https://cdn.shopify.com/s/files/1/0436/7423/9129/files/sonabijiluziganob.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/nipupixinusupokebovopaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/30875983448.pdf
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/dodugo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6439/1845/files/barash_anesthesia_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5032/8486/files/zebuxewew.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1106/files/maponunujat.pdf
    • https://cdn.shopify.com/s/files/1/0439/0082/9848/files/delphi_forum_cbp.pdf
    • https://cdn.shopify.com/s/files/1/0435/4965/5203/files/zagazikusozonoduvegumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/super_smash_flash_2_demo_v0._9b.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_off00007d6b.bin
052f26d69a4fc9cc21221a9ade71a54afc5197ac325710c7614918e49ceaa97b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6B 5056 bytes
font_01_sfnt_off00008ea0.bin
a9dfb9892b572aa60647e7ad1b86e4de4fd12a1ccb020c4519f4445af78e69ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA0 10300 bytes
font_02_sfnt_off0000b1e2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 4324 bytes

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