Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a0f34f900cf2e3…

MALICIOUS

PDF

43.1 KB Created: 2020-08-14 20:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39ab712202429eb92052e97ab417e78d SHA-1: e3a717716f5e1ac6192c2c9f708a6fd1e2bb54b6 SHA-256: 67a0f34f900cf2e3346ad54903b46bea7e3a2dfc354d871f6002e041e94254e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a malicious intent to direct users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=maria+west+side+story+pdf
    • http://files.wonderstonefilms.com/uploads/1/3/1/3/131380063/viriguxa_juwegifujat.pdf
    • http://gokil.boonachepresents.com/uploads/1/3/0/8/130814535/de3761.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/70111076356.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5215/files/wabapotezuziderabuzideleb.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/dekufudosopurumudab.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2805/files/comment_draguer_une_fille_difficile.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/buxajojipukagizezediju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokixud.pdf
    • https://cdn.shopify.com/s/files/1/0429/5426/0633/files/nelly_furtado_allgood_things.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5634/files/lojesusutuwopow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2680/files/lajadulelel.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/very_hungry_caterpillar_printable_coloring_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8072/files/except_in_sql.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2187/files/golang_socket_server.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_off00006b52.bin
3963c818933f25f4317d00c537e39ba4e76bd8ecfe565e7abe9873b6bea761d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B52 5204 bytes
font_01_sfnt_off00007d31.bin
7a423cb285c9670de7bee37cc0bd02a0c05b99009ed78af015b26d5a214429fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D31 10128 bytes