Malicious PDF — malware analysis report

Static analysis result for SHA-256 791589f64c21f873…

MALICIOUS

PDF

60.4 KB Created: 2020-07-30 18:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa6a6b00e798b82a2b066e87e373088a SHA-1: 6ba3b9513b032193e24f16ea4c089449e985655b SHA-256: 791589f64c21f873a6f2da3da1fd5582501cf3fed19904a30028b31a1edc73cf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, suggesting an attempt to generate traffic or distribute malicious content. The presence of a 'download button' lure further supports a phishing or redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=general+knowledge+arihant+publication+pdf+download
    • http://files.studentoutreachclubs.com/uploads/1/3/0/7/130775085/gututoxepemufadapiz.pdf
    • http://files.protononprofit.com/uploads/1/3/0/7/130775753/taxixirifaden_togig_vesirut.pdf
    • http://files.clarkcdc.com/uploads/1/3/1/4/131453943/f8545f0533.pdf
    • http://files.swestend.com/uploads/1/3/2/3/132303351/kuwugubeni-motezijaxogefum-xebuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42228357160.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/34685422022.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/6465156165.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vijob.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8072/files/dotapirelepibeluji.pdf
    • https://cdn.shopify.com/s/files/1/0435/9153/2699/files/95293083029.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/47205703385.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/banasumuwakoxinuwifotaze.pdf
    • https://cdn.shopify.com/s/files/1/0435/0305/9110/files/73040764739.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/gupetisizozadajepedeki.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/58151983298.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/44571899392.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/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ebc.bin
2c7b0d2819f652918fd775059e15b3ad62a9122455ee03a478e782cf7e4a7b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBC 5448 bytes
font_01_sfnt_off0000914e.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x914E 3720 bytes
font_02_sfnt_off00009cb1.bin
1429bab70d56f3a706c8d29ccddb0bdddf750e6338cf099b94b9466c6b53fbed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB1 14352 bytes
font_03_sfnt_off0000c973.bin
1e9c354ede84706bfd8048cab15b88aa7462a66dff1658f81fc515d40ac5298d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC973 7756 bytes

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