Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f636db47245565…

MALICIOUS

PDF

53.5 KB Created: 2020-08-24 10:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24303ef7e78fc2f9c9d34c2035c903ac SHA-1: e94b677ca8fda07de22fdd156ed4dcfdea6293aa SHA-256: 75f636db47245565ed3bd547b4192dca7b4b891a818e6be9faa98ef8ff6dbd15
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical heuristic identifying it as a redirector to malicious infrastructure. The document body also contains a link to a known malicious redirector, disguised as an employee feedback form. The ML classifier strongly indicates maliciousness, and the presence of a download button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=employee+feedback+form+email+template
    • http://zamiwabo.tipsyglasswinery.com/uploads/1/3/2/7/132740829/4b7cb0f7ddc829a.pdf
    • http://sokuz.supercoolyconcepts.com/uploads/1/3/1/3/131398140/gixez.pdf
    • http://kogosa.ispinwood.com/uploads/1/3/1/4/131408100/momemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1104/6558/files/aamirror_plus_apk_indir.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/pollination_and_fertilization_in_flowering_plants.pdf
    • https://cdn.shopify.com/s/files/1/0437/1926/2357/files/87642021110.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/tesujidak.pdf
    • https://cdn.shopify.com/s/files/1/0439/5696/1438/files/zefivokabibetamitez.pdf
    • https://cdn.shopify.com/s/files/1/0448/0958/4802/files/janatha_garage_songs_telugu_naa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2854/5693/files/fisoronosibiruwapot.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1147/files/35567071192.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/58673402496.pdf
    • https://cdn.shopify.com/s/files/1/0438/2418/5506/files/insolvency_and_bankruptcy_code_2020_latest.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/folazugumawavazaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/netufive.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f79.bin
8228c821c2af10b3e7e42166a67a8f80f049d5eef52378ae6521c8c2cd356a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F79 5068 bytes
font_01_sfnt_off000080c0.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C0 1800 bytes
font_02_sfnt_off0000894e.bin
db43cfe32610889442ca6748ad7be84d31967a61e8e48b3b5aaec0f6231856a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894E 15844 bytes
font_03_sfnt_off0000ba84.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA84 4324 bytes

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