Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e322f4e2f9b771…

MALICIOUS

PDF

40.9 KB Created: 2020-08-25 19:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edaea1e744421dba32a201a7e9e47540 SHA-1: 98d2a6ab2984dc5b78424451ce4606c29d574d07 SHA-256: f4e322f4e2f9b771cad98b2886dff22f698014f92461ddbc1363ea8296dbd4c5
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 of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or SEO poisoning attack designed to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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.ru/pify?keyword=contemporary+world+history+textbook
    • http://files.handhinsurance.net/uploads/1/3/1/4/131438539/mefezipopeke.pdf
    • http://baleg.ifixcaravans.com/uploads/1/3/1/4/131453850/nerorevutu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6006/files/cannon_powershot_s2_1s.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4567/files/libukavinulew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/zotusomolujulutopigoninaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/abel_s_driving_school.pdf
    • https://cdn.shopify.com/s/files/1/0429/4157/9420/files/422345458.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1655/files/adobe_pro_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0438/2674/1405/files/baruxufuveko.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/92494040457.pdf
    • https://cdn.shopify.com/s/files/1/0433/8004/8023/files/90735930388.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_off00005fab.bin
ff9e108d4bca9a776e8a46c418c41913072f660d95a7b7e82572d1eee07b4737		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAB 5572 bytes
font_01_sfnt_off00007276.bin
41949900a461b318750eae4cd140c3503b51628b695129c6026e3bd051d47c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7276 10796 bytes

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