Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df2b4fd8976a21f…

MALICIOUS

PDF

51.4 KB Created: 2020-08-07 19:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec18e40a4930f8894814a068d86374ce SHA-1: 3346e43045b532c7cfc09f191d00fee7ec6fdca2 SHA-256: 7df2b4fd8976a21fd200fb71fd29008f6b3a15019a3bc86a49befedec4642926
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing for a link farm and another for a redirector to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest an attempt to lure users to harmful content, possibly for further exploitation or phishing.

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=ajahn+chah+biography+pdf
    • http://gojijile.europeanmasterswl.com/uploads/1/3/1/6/131607163/1022284.pdf
    • http://files.wellswoodcivic.com/uploads/1/3/0/7/130776268/9676318.pdf
    • http://files.boulderhomezone.com/uploads/1/3/0/7/130775027/ccdec79fea8.pdf
    • http://files.addingtonforge.com/uploads/1/3/1/8/131871627/pafezaxubepur-gabaxa.pdf
    • http://files.carawaydeafyouth.com/uploads/1/3/1/1/131163846/rizafobot-jotekaladanegel.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8135/files/dobezesudiwagapezeno.pdf
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/how_to_get_tensorflow_version.pdf
    • https://cdn.shopify.com/s/files/1/0440/2970/6390/files/ankylosing_spondylitis_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2276/files/fefanosidafor.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/12067793884.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/53937975752.pdf
    • https://cdn.shopify.com/s/files/1/0439/9818/3582/files/38349894201.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/48456180421.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/43027083611.pdf
    • https://cdn.shopify.com/s/files/1/0432/4737/0402/files/39115736322.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_off000067b6.bin
4d1637cbcada63035cd5b250e9a67d83a7d8e947a5f041810c2a0efc70d3f7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B6 5512 bytes
font_01_sfnt_off00007a72.bin
c1c02f8dfbeb34803941823f2d73cc7fe4b4b608a0181b6f1ced2515782061a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A72 8624 bytes
font_02_sfnt_off00009231.bin
74130669772229329faa78b6749c2d395af9f6dfc2496273f7ce25f11d753e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9231 15092 bytes

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