Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b7137bcd53372d…

MALICIOUS

PDF

42.3 KB Created: 2020-08-12 08:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b65bb6e939f5299d1c928f3868209c6d SHA-1: ecca85b12490c1739e0e80d8ace45165c4d6e398 SHA-256: 41b7137bcd53372d73f22d62204c570f0b7c21857ad14144129cd7e15afa5caa
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=starry+starry+night+chords+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=starry+starry+night+chords+pdf
    • http://files.bellacalore.com/uploads/1/3/0/8/130814279/mumubimogamu-fupedevumebat-ropetiwajo.pdf
    • http://wanavoren.mrandmrsleadstraining.com/uploads/1/3/1/4/131438888/5287651.pdf
    • http://files.tackleproducts.co.nz/uploads/1/3/1/3/131383743/zolabuj.pdf
    • http://moguvoko.sfventuresgroup.net/uploads/1/3/0/7/130739777/sitowukinorofe_nalakipaf.pdf
    • http://fuvepor.downtowngrowers.org/uploads/1/3/2/7/132740873/1214294.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/sitazegig.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/gibogadataxemusi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/sazapap.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/6259738552.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/honda_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/allopathy_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/33766465901.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/komuzoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/manatawike.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/54967541306.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/jet_look_what_you_ve_done.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/cambridge_igcse_chemistry_study_and_revision_guide.pdf
    • https://cdn.shopify.com/s/files/1/0448/9006/3003/files/bcom_1st_year_books_in_gujarati_medium.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_off00005ad5.bin
eab4118a1fcae79cc8276cdb87b81da4b5b3e04b6491d4a0c34af316411e8d79
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD5 5592 bytes
font_01_sfnt_off00006dc9.bin
4e5153d0b0dfa96b8dfadc6a0ab572f2fd01ef253f9654e968c318dcf162e789
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC9 14908 bytes