Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cf7985ffad4961…

MALICIOUS

PDF

44.0 KB Created: 2020-08-10 00:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c52f1a5b27ccd1492c113023fd852238 SHA-1: 00c1165458682fbdb5645d9ebbc0112495415bcb SHA-256: 63cf7985ffad49614709eb221fb5a49cabfaba297e410bf0117a5da940b212c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL, indicating an attempt to lead the user to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a campaign to distribute further payloads or engage in phishing. No scripts were extracted, but the primary attack vector appears to be the embedded malicious URL.

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=calendario+formula+1+2020+orari+tv+pdf
    • http://files.shhschoir.org/uploads/1/3/0/8/130873893/mokefibegepamef.pdf
    • http://files.greentreeassociation.com/uploads/1/3/0/7/130740517/koxoke-xunigex-titenowesubi.pdf
    • http://buwonep.streetash.com/uploads/1/3/1/0/131070152/pajezevoja_pepijejuwaruwif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6482/7805/files/duxebovo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/sutenepaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7114/3078/files/4003154124.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/corso_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/bupuzepikogu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7424/7069/files/sojujutelefizugom.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5503/files/45062315723.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1395/files/barangay_clearance_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/79538827424.pdf
    • https://cdn.shopify.com/s/files/1/0439/2324/3176/files/ccrn_review.pdf
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/rufozulupefusoliluxapamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/warband_tax_inefficiency.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c5f.bin
847f8a4bf451b41e3135bd2599f1cca84611c704c1054b52873ad929431ac1d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5F 5300 bytes
font_01_sfnt_off00007e5a.bin
0c574792c1a805e8315150ec79f948a68d2a67acb6002ad44e61ea472bad3cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5A 10940 bytes