Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bbeac52af7d61a…

MALICIOUS

PDF

46.4 KB Created: 2020-08-13 19:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6886fb0af0864ed4c070ecb7de0f71f4 SHA-1: 159338319283e56e096ccb1630855eb578410868 SHA-256: 36bbeac52af7d61a060bc4b10646214b4aff9cf0df8996c912a8b696eae0e9e6
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for academic content, specifically 'cengage organic chemistry pdf quora'. This suggests a phishing or scam attempt to redirect users to malicious sites. The presence of numerous embedded links, many pointing to Shopify, further supports the SEO link farm heuristic, indicating an attempt to manipulate search results or traffic.

Heuristics 3

  • 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.
  • 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/wb?keyword=cengage%20organic%20chemistry%20pdf%20quora
    • http://files.theartofclearing.com/uploads/1/3/2/6/132681443/mixokarebiwowol_magesofilenufe_bixetokala.pdf
    • http://files.affinitycleaningco.com/uploads/1/3/1/3/131398504/9468327.pdf
    • http://files.ilovelearningasl.com/uploads/1/3/2/7/132712093/gogenir.pdf
    • http://lotirim.sprucecafe.com/uploads/1/3/2/3/132303124/244c2744b.pdf
    • http://bugore.lebanonstingerswrestling.com/uploads/1/3/1/6/131606289/d4da483.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/marvel_graphic_novel_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/tepuxomepavegiged.pdf
    • https://cdn.shopify.com/s/files/1/0428/8996/9820/files/folk_catholicism_in_the_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1661/files/1435114942.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0433/files/81221041082.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/northstar_4_reading_and_writing.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/zogupowugobus.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/12602927959.pdf
    • https://cdn.shopify.com/s/files/1/0431/9176/3105/files/ncert_exemplar_class_11_chemistry_full_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/digital_electronics_full_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/96084649395.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/22928563458.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_off000073d4.bin
461546c458473fb8e37daa09024d7b460b179b89aa1e8f655cafda25b1bc5f76
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D4 5668 bytes
font_01_sfnt_off000086ec.bin
63d86be23b5cac35b5d589e57d324b7717ad66ad4fcfe7f1812a9ae650c5dbbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x86EC 11000 bytes