Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fb6565d7b9353d…

MALICIOUS

PDF

49.1 KB Created: 2020-09-14 05:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6496459296673e422bb2572ddba43dd SHA-1: 8959fde4ff169e4ca16322375a9b2a6f554167e1 SHA-256: a0fb6565d7b9353d75580c81672bf7a3eba32dd2d761448546c5d57392fa97e5
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a mass link farm, suggesting an attempt to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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.me/wix?keyword=32oz+to+one+gallon
    • http://files.countrycharmflorist.com/uploads/1/3/0/9/130968984/1983710.pdf
    • http://vatevete.outonalimbdance.com/uploads/1/3/0/8/130874588/mepidukokuburinak.pdf
    • http://files.reidswoodworks.com/uploads/1/3/1/8/131857199/gimavudumube_wuluji.pdf
    • http://files.pamelatuazon.com/uploads/1/3/2/6/132696558/8734884.pdf
    • http://zefomuwe.beejaysecuritydoors.com/uploads/1/3/1/1/131164250/xukeguzodupeti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63491738983.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/cubs_2020_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0440/8023/4661/files/73866435169.pdf
    • https://cdn.shopify.com/s/files/1/0431/7796/7776/files/lofepijifemuri.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/femugofinus.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/epistar_chip_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3664/7317/files/1788520541.pdf
    • https://cdn.shopify.com/s/files/1/0437/5196/4830/files/sears_radial_arm_saw_recall.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6631/files/throwing_up_emoticons.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/wurapaviwizupugane.pdf
    • https://cdn.shopify.com/s/files/1/0428/7257/0012/files/5794058502.pdf
    • https://cdn.shopify.com/s/files/1/0462/2372/0602/files/block_blob_tostream.pdf
    • https://cdn.shopify.com/s/files/1/0429/8060/6111/files/xatitipe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006074.bin
f31da6d88548eec5c851a0f80c4f997e1a9dd6836ad01586cdddc4ec83b74a64
pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 4572 bytes
font_01_sfnt_off00007010.bin
c2e894da3d7eaac72133a9b1338f14e2bbbe30fd6216a5ba3073212a8e7b0fad
pdf-font-stream PDF embedded font (sfnt) at offset 0x7010 10316 bytes
font_02_sfnt_off00009391.bin
9aaf374d64521945a2d179b3de22a0ad451813c1e8d23897d9514ef9876b453b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9391 16216 bytes
font_03_sfnt_off0000a8c7.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C7 4324 bytes