Malicious PDF — malware analysis report

Static analysis result for SHA-256 836f62c63d693e74…

MALICIOUS

PDF

45.5 KB Created: 2020-08-05 16:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 129f439b8fdd0d56dba18bfc8c1b8ec5 SHA-1: fcf43756f218c7ffd854027beeddf6d9c27f7923 SHA-256: 836f62c63d693e74bc1a7fd0089c26a87db49a63d0341df4600b4cb0da04a622
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector service, which is a common tactic for distributing malicious content. The document body and extracted URLs suggest a lure for downloading PDF files, likely to distribute malware or phish for information. The presence of numerous external links, many pointing to Shopify domains, indicates a link farm designed to improve search engine ranking for malicious content. 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.ru/pify?keyword=cfa+level+2+books+pdf+free+download
    • http://rikix.mardenridingclub.co.uk/uploads/1/3/1/3/131383791/dopapopolax_suxorupekekufim.pdf
    • http://files.thekoalaproject.org/uploads/1/3/2/6/132695575/4379331.pdf
    • http://files.usafa70.com/uploads/1/3/1/0/131071082/3e859554d04a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/31087877419.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8557/files/51740083091.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7542/files/phantom_bangla_comics_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/56041393170.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/miduzigevepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2363/8426/files/31858281575.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/shakespeare_insult_generator.pdf
    • https://cdn.shopify.com/s/files/1/0432/2584/1821/files/17215304335.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5832/files/estudio_descriptivo_sampieri.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0175/files/74163142965.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000637a.bin
48f8c7fba4654f7cfa2b6c034685f89dee14e91f56a8a67d36e4c6069af09369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637A 5208 bytes
font_01_sfnt_off0000754e.bin
b60767f09bb79c70fbab161427624277391062ade798ff027f09fa976491f3ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754E 11180 bytes
font_02_sfnt_off00009b09.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B09 4324 bytes

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