Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7b8591192ce819…

MALICIOUS

PDF

46.3 KB Created: 2020-08-19 01:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5708290639e1a2e7ec42aacd66077f8 SHA-1: 727b1c4e811450a94df12616aaf67854cc3cbe5c SHA-256: 1c7b8591192ce8193a2bf531e57bfe707fa15ad351671cedf526b9a97ca23480
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the same malicious URL and a reference to 'comprehension passage for grade 8 with answers', suggesting a lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the ttraff.com URL, and 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely for SEO poisoning or to distribute the malicious payload.

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=comprehension+passage+for+grade+8+with+answers
    • http://files.anikosspa.net/uploads/1/3/0/7/130776486/vinilitu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7218/2685/files/71822113022.pdf
    • https://cdn.shopify.com/s/files/1/0434/3277/1750/files/42015080467.pdf
    • https://cdn.shopify.com/s/files/1/0429/8145/8069/files/kimedoxuwirilewamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/62371705696.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/xakatupinikog.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6534/files/74316449801.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/tundra_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/4448/5790/files/catcher_in_the_rye_chapter_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/0346/1283/files/bidujulez.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/29045397776.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/giovanni_boccaccio_decameron.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_off00007457.bin
74e6a1a880e10bda855bd721728f33634818359a025d6db663b3b030d047d6c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7457 5616 bytes
font_01_sfnt_off00008750.bin
a70e5882c5e4bcb4d0195a97f7eb1065b560f0a5c7160aed12f6d87477d20630
pdf-font-stream PDF embedded font (sfnt) at offset 0x8750 10864 bytes