Malicious PDF — malware analysis report

Static analysis result for SHA-256 26fd930f8c11ef46…

MALICIOUS

PDF

42.2 KB Created: 2020-08-23 07:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4de44c32b2cb8ac2a02663df41211e2 SHA-1: 020eba7d99cee6775178096f25aef526096f4f32 SHA-256: 26fd930f8c11ef468dfabbcb55e25694bd1c056f37752bd4154ec5ecfadb34d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the text 'Do chigger bites form blisters', suggesting a lure to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=do+chigger+bites+form+blisters
    • http://bokurano.iprintz.shop/uploads/1/3/0/7/130774965/disotedekozuzif-fetok-fukevo.pdf
    • http://files.wedroseacres.org/uploads/1/3/0/7/130776483/kekov.pdf
    • http://files.tmvideoproductions.com/uploads/1/3/0/7/130740191/dijezanuvopudo_fagewivujikek_venetobuwi_kalekir.pdf
    • http://files.fieldstonefarmllamas.com/uploads/1/3/0/8/130814032/7821639.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/acido_acetico_forma_molecular.pdf
    • https://cdn.shopify.com/s/files/1/0432/0785/2192/files/salubudif.pdf
    • https://cdn.shopify.com/s/files/1/0431/2124/6359/files/95919874600.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0314/files/izotope_ozone_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0559/files/96843375749.pdf
    • https://cdn.shopify.com/s/files/1/0436/3816/1561/files/panchatantra_stories_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/socialismo_utopico.pdf
    • https://cdn.shopify.com/s/files/1/0433/2837/2886/files/sujet_brevet_sciences_pondichery_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/4577/2698/files/54321235165.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0803/files/tejulexinabirisubulasi.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000661e.bin
7a4e47b8e99a4421c163f43d25d542b6db851f64da3e7a43f70132467ce14a4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x661E 5224 bytes
font_01_sfnt_off000077cb.bin
c53a49ee093440f4d5f3b88e616732122610ed77bf2b2db5d69eee109d6128c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x77CB 10528 bytes