Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9acdca08f05516…

MALICIOUS

PDF

38.2 KB Created: 2020-08-14 12:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0857c096e2f7fa2694b26d35ab5f83cc SHA-1: 4b7b0d144b2b00f53fe53335a9534a7c4d91a3ed SHA-256: ff9acdca08f05516445c8f30607572c616e76695ba8a1e4d38a3c2b449fcfc5b
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, which is indicative of a link farm designed to improve search engine rankings. One of the primary links, 'https://ttraff.com/wb?keyword=modern%20physical%20organic%20chemistry%20pdf%20free%20download', is flagged as a malicious redirector. This suggests the document's purpose is to lure users to malicious infrastructure under the guise of providing free academic resources.

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/wb?keyword=modern%20physical%20organic%20chemistry%20pdf%20free%20download
    • http://files.garydawsondesigns.com/uploads/1/3/1/0/131069915/paxogedasep.pdf
    • http://negereba.rsconcerts.org/uploads/1/3/2/8/132814337/4cbae3a9d.pdf
    • http://files.greater-faith.org/uploads/1/3/2/6/132695511/sajofow_gefewowu.pdf
    • https://cdn.shopify.com/s/files/1/0445/5071/7604/files/zosofu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/92589356748.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/padolabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2908/files/rpp_descriptive_text_smp_kurikulum_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/wapawidexumurezegaxos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwotowomezi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/84312738396.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4204/files/bmo_harris_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0447/9886/9653/files/antiphospholipid_syndrome_nejm.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/pikekarojixobowimavuwaxef.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5074/files/speaking_ielts_band_9.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/39713764700.pdf
    • https://cdn.shopify.com/s/files/1/0435/5221/1099/files/83200055583.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cb8.bin
21202c33759afa730822c716ddeaa1f43be53bae07adf1c19adf01e00dad5bb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB8 5768 bytes
font_01_sfnt_off00006046.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6046 1800 bytes
font_02_sfnt_off000068d4.bin
809493fa8ed22498d677d8910a3d4fc73a76646d964cf3be56a12632d9abf3c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D4 10232 bytes

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