Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0d00be70c99411…

MALICIOUS

PDF

45.8 KB Created: 2020-08-10 08:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccf3ad003cf06c0083f114ad7017f5d3 SHA-1: a4a2ce4c437f02b5bbcef66481baca5cedaad6de SHA-256: 7b0d00be70c9941194d494916819e47ca2eea1fc08e1eb8d77d5d3cb45048338
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as free book downloads, a common SEO poisoning tactic. The primary link, 'https://ttraff.com/pify?keyword=textbook+of+biochemistry+with+clinical+correlations+pdf+free+download', is a known malicious redirector. This indicates the document's purpose is to lure users to malicious infrastructure, likely for further exploitation or credential harvesting.

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=textbook+of+biochemistry+with+clinical+correlations+pdf+free+download
    • http://files.kimberlyenglish.com/uploads/1/3/1/4/131453174/kalulubalaguw.pdf
    • http://files.christianabroughton.info/uploads/1/3/2/6/132680831/1349618.pdf
    • http://files.topsaharatours.com/uploads/1/3/1/4/131453060/pofil.pdf
    • http://files.thespeakerstore.co.uk/uploads/1/3/2/7/132740281/taxanorokatuw-vomupelix-vavireve-kugowibe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/lemijojon.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3450/files/teribukasule.pdf
    • https://cdn.shopify.com/s/files/1/0430/2916/8282/files/befitexujepekitorinup.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/oceans_hillsong_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/19603108333.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/sosinobifeme.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1268/files/jizijoraderapisezew.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/dopagujadurop.pdf
    • https://cdn.shopify.com/s/files/1/0434/8428/3033/files/11102053635.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/laderakobag.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4641/files/familia_unipersonal.pdf
    • https://cdn.shopify.com/s/files/1/0437/2535/7206/files/ampere_s_circuital_law_proof.pdf
    • https://cdn.shopify.com/s/files/1/0428/5490/8071/files/dododogikumewinefaj.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_off00007389.bin
6f6fb7f5737e396fd045c0eb8ba1d70aa177999247d3fd34e174bf84da03d88e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7389 5808 bytes
font_01_sfnt_off00008743.bin
af6e1bfa75384632b2665ff24640608de2fc15a583a320c3ba67920b65e7d189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8743 10120 bytes

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