Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9a7c9f57a8a7cb…

MALICIOUS

PDF

41.1 KB Created: 2020-08-19 03:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f1580283a729a09f5e1694c0372f25e SHA-1: f4f14f1f2b5d1f625cfa60e681c9f780a57ee0a4 SHA-256: 8f9a7c9f57a8a7cbdd19817eaf5f2dcc248353e9db0a07cc16603ef728fdd73b
128 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'linkedin profile background image template'. This URL redirects to ttraff.cc, which is flagged as malicious. The presence of numerous links to Shopify PDFs suggests an attempt to blend in with benign content while distributing malicious links.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=linkedin+profile+background+image+template
    • http://files.upegroup.com/uploads/1/3/1/4/131483830/a70462b226adebd.pdf
    • http://fikore.sreesharadamba.com/uploads/1/3/1/4/131438437/9245115.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3133/files/53341027967.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/zuwixoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18187133080.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8073/files/wowipezakalupuvajizivepa.pdf
    • https://cdn.shopify.com/s/files/1/0449/6611/7544/files/oxford_dictionary_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/big_data_tutorial_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/dark_souls_2_greatsword.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetuvoveluganimuwejipas.pdf
    • https://cdn.shopify.com/s/files/1/0433/6333/6350/files/sikariware.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/gaxoxisuvovexolevod.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/brain_fog_fix.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/11440541314.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_off0000626f.bin
6dccd250fd296f9e6f8c4e96123199fc3d9ddfe95dbb6e069bb10f5f65cce3e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626F 5440 bytes
font_01_sfnt_off000074da.bin
889f8609936ad88ad054f464b0aab9747d383fe494e980d98c8978606dd129b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DA 10128 bytes

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