Malicious PDF — malware analysis report

Static analysis result for SHA-256 671f7ac6c53c6239…

MALICIOUS

PDF

37.6 KB Created: 2020-08-15 22:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c67ee62d4c88a0065c010b9a7149a1ea SHA-1: c4378977aefabccfafcd164c81eabf2b8eed84e8 SHA-256: 671f7ac6c53c62395c728009d33254cc318eae5abffdff6a3f4f828ee0149745
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to drive traffic to malicious sites. The document body, though heavily obfuscated, contains the malicious URL and references to downloading content, aligning with a phishing or scam lure. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=superman+full+hd+wallpaper+free
    • http://disasefo.sarahwisemanphotography.com/uploads/1/3/2/3/132303012/538e7ba78d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3493/5447/files/dunodixomiwurujube.pdf
    • https://cdn.shopify.com/s/files/1/0428/2646/5436/files/93771279256.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/personality_traits_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/8729/8714/files/97206455649.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/vonafonivevefipixopilet.pdf
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/13106105357.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6207/files/18307882213.pdf
    • https://cdn.shopify.com/s/files/1/0431/3638/5175/files/95801849598.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6074/files/alarm_clock_apk_uptodown.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/bufotof.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/revolowoxofulobusuzikemab.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_off000053c7.bin
e8510b52c40bc42e191c8627bf7168a7d88a01fcbc68cce30295a60b6ca4b0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x53C7 5296 bytes
font_01_sfnt_off000065b0.bin
0d5e7ffaaacbed9e47ee611ddec31bb98af185ef503ea393820c528def060c09
pdf-font-stream PDF embedded font (sfnt) at offset 0x65B0 10600 bytes