Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a7d0576e900b01…

MALICIOUS

PDF

45.4 KB Created: 2020-08-10 15:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cf523c28481f938218d6a70a1330bff SHA-1: 21dab5c1367c660b90d9068564bb076a34fe3322 SHA-256: 99a7d0576e900b0160b73ec2f4f3fc1d208139168ceb22c08f9990b8a26ab25b
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'https://ttraff.cc/pify?keyword=kayaking+merit+badge+workbook+pdf'. The document body, though obfuscated, contains text related to a 'kayaking merit badge workbook pdf', suggesting a lure to entice users to click the malicious link. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=kayaking+merit+badge+workbook+pdf
    • http://files.peterbellinghamillustration.com/uploads/1/3/0/7/130740212/zedux.pdf
    • http://files.affordmyinsurance.com/uploads/1/3/1/4/131453436/4d1a25fdc771264.pdf
    • http://files.shannonkerseytherapist.com/uploads/1/3/0/7/130776478/4411135.pdf
    • http://files.daventrydogtrainingclub.com/uploads/1/3/0/8/130873973/6745225.pdf
    • https://cdn.shopify.com/s/files/1/0431/4634/6657/files/wedding_march_felix_mendelssohn.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/revista_natura_ciclo_10_2020_argentina.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0487/files/xokatomege.pdf
    • https://cdn.shopify.com/s/files/1/0435/9723/4338/files/grille_d_accords_guitare.pdf
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/rixuvovoxamazinevipemu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/fiwetojivodogutu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3851/5098/files/6430725211.pdf
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/hurricane_spin_scrubber_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9382/6463/files/28508057160.pdf
    • https://cdn.shopify.com/s/files/1/0435/6194/3199/files/texto_em_ingles_com_traduo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5217/9364/files/japojizifal.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/28529617918.pdf
    • https://cdn.shopify.com/s/files/1/0428/9429/5203/files/zujatetofasadu.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_off00007246.bin
73585f5fec6e8800709239675814c958968fcc0e6ed1aee5a44e417faf7371d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7246 5516 bytes
font_01_sfnt_off00008504.bin
609bfc3cbc431227f6a3d4429bf65bbfeb5bc24d4d58a741fe8012944f23d809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8504 10504 bytes

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