Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b9e38454a344a6…

MALICIOUS

PDF

44.5 KB Created: 2020-08-12 00:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6147d3602d3ccd14005ab170e06f22f SHA-1: 8f1e60ffedeb2c79518ded296f9b24034ef80613 SHA-256: a4b9e38454a344a6ce0539aa4203918f47d48cdbbfbc3c0307190a8f8daa2d1c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a calendar template and the malicious URL. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly. No scripts were extracted from this sample.

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=blank+calendar+template+november+2020+pdf
    • http://toraf.justbeau.studio/uploads/1/3/1/3/131384635/fopavobaz-gupumo-rixopovefufob.pdf
    • http://files.rucomingout.com/uploads/1/3/2/6/132681985/4621377.pdf
    • http://files.thewallssager.com/uploads/1/3/0/7/130775846/zofudaxeluzun-vogake.pdf
    • http://files.idontknowwhatimdoing.org/uploads/1/3/1/4/131408169/a55e967c.pdf
    • http://files.trilogysoftball.com/uploads/1/3/1/4/131407144/kajivag_pudigajotudazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/bioassay_of_insulin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3062/files/vujenakisasimademasewupi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/wexuxorexugaripa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/medarovadujagowurevasote.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/83692505067.pdf
    • https://cdn.shopify.com/s/files/1/0437/6798/8376/files/types_of_advertising_appeals.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/rovutalipujosawemi.pdf
    • https://cdn.shopify.com/s/files/1/0436/6696/4630/files/pijipomureforalalalonot.pdf
    • https://cdn.shopify.com/s/files/1/0430/9339/3557/files/xanamitefigid.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/betuvujilafibamu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/revosodozafilizibavuxepid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006278.bin
03bf4342dfeda148a9d09040b679a66b8de8a0a2968094a390fb71484c29e67f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6278 5452 bytes
font_01_sfnt_off000074e1.bin
2e94d125c2e79d58dc01e2cd299e69f3024e71fc79e42c7d84cf396458f87a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E1 9812 bytes
font_02_sfnt_off0000967b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x967B 4324 bytes

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