Malicious PDF — malware analysis report

Static analysis result for SHA-256 f323d7d63f4f326e…

MALICIOUS

PDF

47.1 KB Created: 2020-07-10 02:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29127f0b0afee873c9398afb412ba742 SHA-1: 74a580ade0801e8bded12f5017df18bbdc50f9d1 SHA-256: f323d7d63f4f326e4201d5b3cd5be24e3200fc2ed1d3d096498bef1e25b15932
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, including a primary redirector URL, that are designed to lure the user to malicious websites. The document body, while obfuscated, suggests a lure related to 'ionic compounds names and formulas chem worksheet 8-3 answers'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of links to known malicious infrastructure, and PDF_SEO_LINK_FARM indicates a large number of outbound links, likely for SEO poisoning or to distribute further payloads. The ML_NYX_PDF_MALICIOUS score of 0.999990 strongly supports the malicious classification.

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/wb?keyword=ionic%20compounds%20names%20and%20formulas%20chem%20worksheet%208-3%20answers
    • http://files.keepoaklandbeautiful.org/uploads/1/3/0/7/130739120/dasukujoxofuj.pdf
    • http://files.millbrookrotarydirectory.com/uploads/1/3/0/7/130775846/d99ea.pdf
    • http://files.customdivingservices.net/uploads/1/3/2/8/132814123/tivomesivogid.pdf
    • http://files.poleshiftnews.com/uploads/1/3/2/8/132815961/493882.pdf
    • http://files.romainewashington.com/uploads/1/3/1/8/131857193/ropodefi.pdf
    • http://files.cedarcrestcc.com/uploads/1/3/1/3/131380236/6fac3cc5d.pdf
    • http://files.jcprhac.org/uploads/1/3/0/7/130740330/8869516.pdf
    • http://files.shoalcreekbaptistassn.com/uploads/1/3/1/4/131412235/be1b5a7fd28a.pdf
    • http://files.joshuabgood.com/uploads/1/3/1/8/131857655/099f56ef4.pdf
    • http://files.araiacademy.com/uploads/1/3/1/6/131606874/8b1cbb2df8.pdf
    • http://files.merarifernandez.com/uploads/1/3/1/4/131407165/6839308.pdf
    • https://gimeworefa.files.wordpress.com/2020/07/widobatagedipipu.pdf
    • https://xudawipopa.files.wordpress.com/2020/06/bijeperemajasamewusiwo.pdf
    • https://bozajimiko87086636.files.wordpress.com/2020/07/80429201189.pdf
    • https://lunegaj.files.wordpress.com/2020/07/lilovifev.pdf
    • https://madivobi.files.wordpress.com/2020/07/kakaxemebures.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56966684837.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kaxepetumikikexozifaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sexewagufik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.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_off00007751.bin
f941d52a6a707d90c9d4cd46d460c8fb08cef7b0307a3b2f6f27c11af9ae36ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7751 5760 bytes
font_01_sfnt_off00008ad2.bin
c9a7ba91e9683203dcdbfc311a717f4dcc5fd692776aad8ccb572903418e6531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD2 11064 bytes

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