Malicious PDF — malware analysis report

Static analysis result for SHA-256 091551d01290fbad…

MALICIOUS

PDF

44.7 KB Created: 2020-08-09 17:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55641a0aa8776ca847a799710c61a2fc SHA-1: d64054184b819971b2e77db8bb5f710acd0ba67c SHA-256: 091551d01290fbad8061362f00a1b405aa05ff20888ca9f26cbd0388e7d3bf74
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a deceptive document body and numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating an attempt to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=civil+engineering+interview+questions+on+buildings+pdf
    • http://files.wired4successlifecoaching.com/uploads/1/3/0/7/130739525/fititariziz.pdf
    • http://nafiko.xiphospress.com/uploads/1/3/1/6/131637016/watorisozo_janesiwenidani_movasatupon_libifevivofi.pdf
    • http://wewitod.jordanbeeks.com/uploads/1/3/1/4/131407921/nokatelikuro.pdf
    • http://files.kentchancpe.com/uploads/1/3/0/9/130969489/wewubiwufakime-rejanobumefatu.pdf
    • http://files.jwphotogallery.net/uploads/1/3/1/6/131606121/dedepojerominewax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/28983667366.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/59734683150.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/highly_compressed_movies.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/xojesanidamovilam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rojifibopi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/tutorial_arcgis_10._3.pdf
    • https://cdn.shopify.com/s/files/1/0434/3106/7813/files/37030313938.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/wovepibobox.pdf
    • https://cdn.shopify.com/s/files/1/0435/4002/1407/files/tezomaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/noziwemiseduledezelesu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/administrao_publica_concursos.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a70.bin
6a022642113e3912c7fab0b55e92d2ca958334ff8e33b9baef1a36be8f12b517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A70 5324 bytes
font_01_sfnt_off00007ca2.bin
910e0ad3ae4189252cb48ad9bd642c3f09a33710c7f5569570ed418ba297e083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA2 12988 bytes

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