Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a668b29a2a3164…

MALICIOUS

PDF

41.6 KB Created: 2020-08-21 09:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48f69c6a7a0b59d4a72ca822a0d80271 SHA-1: 0286b41991657c35f8813cc5df5314ef7b054dc2 SHA-256: 71a668b29a2a3164eeb237251187651e448f588b0236f4ccee622a5e12ebf1b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for users to click on links, potentially leading to further malicious content or downloads. The presence of numerous Shopify links suggests an attempt to disguise the malicious intent within a seemingly legitimate context.

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=java+1.+8+0.+172
    • http://files.lyc.ca/uploads/1/3/2/6/132695714/c4e1ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/death_of_ivan_ilyich_sparknotes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/bowani.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5823/files/set_typeface_bold_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5727/files/75897568881.pdf
    • https://cdn.shopify.com/s/files/1/0434/1609/2828/files/jerisebije.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/le_petit_bourgeois_gentilhomme.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/60495438555.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/fusionner_sans_logiciel.pdf
    • https://cdn.shopify.com/s/files/1/0433/5462/0059/files/wepemolefopogabiwulo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/73928883497.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/sebobadaxu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/lusogek.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_off00006372.bin
e378f06de293dd52c7918320b8b66ae7f48ca0082f324685f0bf5c145081c8c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6372 5056 bytes
font_01_sfnt_off000074c7.bin
1ccf0890de485167e7c4fe2e62fabf0168cf253b9a51db13b92ac9ac10493abb
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C7 11156 bytes