Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31a72d282e5bcf2…

MALICIOUS

PDF

51.7 KB Created: 2020-08-04 15:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e7d782fa78b8152730e8e688de43c29 SHA-1: a3db0f8831bab251887e145f1540d5099f4617f4 SHA-256: a31a72d282e5bcf2c8fd113823f7faae5b866ea454e77f2c792bfc70530e157e
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely for SEO manipulation. A critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=mcr3u+equivalent+algebraic+expressions+test+pdf'. This suggests the document's primary purpose is to redirect users to malicious infrastructure, potentially for further exploitation or phishing. No scripts were extracted from this sample.

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/pify?keyword=mcr3u+equivalent+algebraic+expressions+test+pdf
    • http://files.thecityofrefugenj.org/uploads/1/3/0/7/130775265/sudezugorutosa.pdf
    • http://files.marshallconservatory.com/uploads/1/3/1/3/131381109/b08d4a9718cd472.pdf
    • http://files.bouttechristian.org/uploads/1/3/0/9/130969176/87a4991953bf2.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/1348582360.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/87188348619.pdf
    • https://cdn.shopify.com/s/files/1/0432/5215/4532/files/68284515051.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6872/7194/files/bedford_reader_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/kipadetexugatep.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/voxibebetog.pdf
    • https://cdn.shopify.com/s/files/1/0450/0822/4414/files/how_to_cheat_on_study_island.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/lomogexolikesulanatimibur.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/35653272144.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/rotating_elevator_openblocks.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_off00007e35.bin
077220bc201cd5cb89aa18358c8729f093c46ed73d68555f3a4f55a32cd99589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E35 5888 bytes
font_01_sfnt_off00009258.bin
6ee4bdc7f0816929b5674c6b7485c3a9139f9c633b79e37d5d5d36ce24279568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9258 15008 bytes

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