Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd35d6fc6b1cf527…

MALICIOUS

PDF

65.5 KB Created: 2020-08-15 17:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee77ea5f365f6e18dab619c69b0ebe8d SHA-1: 8040b7d35372d34a51ab10a34941a9fb9325e5af SHA-256: fd35d6fc6b1cf527c34bc14945ac87ae93c3e0ce815df0173b1b0d0797a2b25c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, many pointing to a link farm hosted on cdn.shopify.com, designed to appear as legitimate downloads. One critical heuristic identified a link to a known malicious redirector at https://ttraff.cc/wb?keyword=bca%203rd%20sem%20notes%20pdf%20download, which is likely the primary malicious payload delivery mechanism. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wb?keyword=bca%203rd%20sem%20notes%20pdf%20download
    • http://files.mrsbeatysclassroom.com/uploads/1/3/1/4/131409305/5c01d.pdf
    • http://files.elermorevaleshoppingcentre.com.au/uploads/1/3/0/7/130775245/narodenina.pdf
    • http://files.essexvet.com/uploads/1/3/1/1/131163599/jikur.pdf
    • http://files.sheleneanderson.com/uploads/1/3/1/4/131406036/1e4f86d16e6a.pdf
    • http://rotenow.courtneysuzannelee.com/uploads/1/3/2/6/132682076/wijekirisigoni_mezonarem.pdf
    • https://cdn.shopify.com/s/files/1/0430/7199/6053/files/promissory_note_format.pdf
    • https://cdn.shopify.com/s/files/1/0447/2363/4330/files/zumukegololugajed.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/dagetaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/vewejowasapiganobuwawus.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/siviwusa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9291/6891/files/30379203216.pdf
    • https://cdn.shopify.com/s/files/1/0434/0029/8648/files/tukunenigikeviwin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0048/7332/files/febaxomonenikezu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/dikewosibuwizego.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/letipagozujuxuxebama.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/pagokupozibam.pdf
    • https://cdn.shopify.com/s/files/1/0428/5887/2998/files/14._3_human_genetic_disorders_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/explaining_reformed_theology.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d75.bin
8de5224d8da9daa6878f80b2df5f0d40d99f9d1fa5631554a2b3c8b201c2d367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D75 5604 bytes
font_01_sfnt_off0000906b.bin
047f04f927fd4b905805c2c48a14cbf22fef35c2447cbf45af8aa0bfe4cfb96e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x906B 2900 bytes
font_02_sfnt_off00009ccd.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCD 2320 bytes
font_03_sfnt_off0000a71d.bin
9cee04d79df1ca0e2242dd89c9723b4493ba70a62f88f4ac5858b3304ce6376d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA71D 16556 bytes
font_04_sfnt_off0000d9c7.bin
7f0e99945e6f1b5ff1b2e5956d1ec163e11e56872442ace1d0beb3a8e855c677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 18732 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.