Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a41cd2e2952255…

MALICIOUS

PDF

62.8 KB Created: 2020-08-05 15:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc73d0f58600896076a162f2a28a3ad5 SHA-1: f2cbf9af93a2b23d0986ec3b79e330cf2020d0ba SHA-256: 31a41cd2e295225545a9c1f0a0e55314be43b53ba584cc552361411ba8222b73
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of these links, https://ttraff.cc/pify?keyword=upadhyay+and+nath+biophysical+chemistry+pdf+free+download, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a scientific PDF download, suggesting a lure to trick users into clicking the malicious link.

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.cc/pify?keyword=upadhyay+and+nath+biophysical+chemistry+pdf+free+download
    • http://files.jglasergifts.com/uploads/1/3/1/4/131453022/xapinuvagod-satoma-xekak-vejemulem.pdf
    • http://files.alphaphiomega-betatheta.com/uploads/1/3/1/6/131606674/f7f5561ec.pdf
    • http://files.sbceh.org/uploads/1/3/0/7/130775277/wazudelodifizeded.pdf
    • http://files.furrygodmothermb.com/uploads/1/3/2/7/132740536/xonepobudibug_juwigesu_jufiv_fomiginapi.pdf
    • http://files.battleatthehive.com/uploads/1/3/2/8/132814024/ludajitufoxim_pikoxawofuful.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3895/files/navunefepidabodafab.pdf
    • https://cdn.shopify.com/s/files/1/0449/6467/5752/files/space_dandy_dub.pdf
    • https://cdn.shopify.com/s/files/1/0438/2805/2130/files/sansumg_ml_2165w.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/1685211806.pdf
    • https://cdn.shopify.com/s/files/1/0437/9253/1617/files/april_showers_proleter.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/8684796530.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/98698467005.pdf
    • https://cdn.shopify.com/s/files/1/0438/7497/5912/files/sixesexurevew.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/lepopegoresogux.pdf
    • https://cdn.shopify.com/s/files/1/0433/8447/1710/files/5530860949.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3985/files/2017_ford_escape_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/entrepreneurship_and_the_characteristics_of_the_entrepreneurial_personality.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/94265586609.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008978.bin
ff3f39f35004e4f8075deb6c70a868c1c18185615d394d78b7cc3d8ae866972a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8978 1716 bytes
font_01_sfnt_off000091f5.bin
92b5860a66aee5821eadbac9faa810a0785c64a3d888c98d0e5259bb54235538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91F5 5720 bytes
font_02_sfnt_off0000a552.bin
dacc5486b28789c3fc9321fab7cad109341ec5c43fd8bcf90e5e779cfa2a962f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA552 15628 bytes
font_03_sfnt_off0000d586.bin
717860a409c70c4bfddc50d2fdcdfdb4d009a247daa781d27df3057258cb1b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 16116 bytes

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