Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf994fa9d559970e…

MALICIOUS

PDF

44.8 KB Created: 2020-08-10 01:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3025f2e27c208f2491f35c20fe5f463b SHA-1: 75fa51c1293da0dfd0d6eddddb46325f08a67f1c SHA-256: bf994fa9d559970ebb27e7c433005e47dd4869b1dd71ec4677c1c100f73f1009
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, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to redirect users to potentially harmful content. No scripts were extracted from this sample.

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=elementary+school+vocabulary+pdf
    • http://files.pianoincolor.com/uploads/1/3/0/7/130776111/kufimopiwubazinogi.pdf
    • http://files.georgeatwood.com/uploads/1/3/1/4/131438641/piwode_vanogafafiliket_xanowaxaba_gemem.pdf
    • http://files.the-remappingcompany.co.uk/uploads/1/3/0/7/130775263/5940408.pdf
    • https://cdn.shopify.com/s/files/1/0428/8456/3110/files/21699773730.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/95802265628.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/59602223251.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/sivesa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0433/files/21818287554.pdf
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/xudovetorutem.pdf
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/lugafilo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3141/files/52871796333.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7175/files/vudurufijumuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/zasadogetev.pdf
    • https://cdn.shopify.com/s/files/1/0434/8549/5453/files/50880416867.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/vce_to_converter_software_free_download_full_version.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_off00006f3f.bin
682c2adc74555dbfd1dd79119637d46e4e2f6cbbd1c65d40fa3918266fdc217d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3F 5652 bytes
font_01_sfnt_off00008254.bin
6991a98b93a31902049f74d404bdba91705ecdb4f8717e60a09e3da59c524258
pdf-font-stream PDF embedded font (sfnt) at offset 0x8254 10616 bytes